Turbocharging system may be designed to operate on either the （） or the constant pressure exhaust system.

If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be （）

A notice of readiness is not valid unless it indicates that the vessel is ready to load or discharge as the case may be，at the time（）it is given.

Where normal delivery at the port of destination is prevented by some cause beyond the control of the master，and the master may and must deal with the cargo for the benefit of its owners by landing it，carrying it，or transshipping it，as may seem best，the Shipowner may then charge the cargo owners with（）to cover the expenses thus incurred in their interests.

Passage ThreeTrees should only be pruned (修剪) when there is a good reason for doing so. Many gardeners believe that more damage results from doing it unnecessarily than from leaving the tree to grow in its own way.First, pruning may be done to make sure that trees have a desired shape. The object may be to get a tree of the right height, and to help the growth of small side branches which will thicken its appearance or give it a special shape. Secondly, pruning may be done to make the tree healthier. You may cut out diseased or dead wood, or branches that are rubbing against each other and thus causing wounds. A tree may grow healthier by removing the branches that are locking up the centre and so preventing the free movement of air.One result of pruning is that an open wound is left on the tree and this provides an easy entry (进入) for diseases, but it is a wound that will heal. Often there is a race between the healing and the disease as to whether the tree will live or die. Pruning is usually clone in winter, for then you can see the shape of the tree clearly without the interference from the leaves.41. According to the article, which of the following statement is NOT true?

The operation of which aids to navigation may be suspended during war or national emergency（）.

Although the Shipowner may be responsible for the loss or damage to the goods，his liability may be limited（）the terms of the contract or the statute.

Practice 3　　A newspaper is much more than a business; it is an institution. It reflects and influences the life of a community; it may affect even wider destinies.　　It is, in its way, an instrument of government. It plays on the minds and consciences of man. It may educate, stimulate, assist, or it may do the opposite. It has, therefore, a moral as well as a material existence, and its character and influence are in the main determined by the balance of these two factors. It may make profit or power its first object, or it may conceive itself as fulfilling a higher and more exacting function.　　Character is a subtle affaire, and has many shades and sides. It is not a thing to be much talked about, but rather to be felt. It is the slow deposit of past actions and ideas.　　At the perils of its soul, a newspaper must see that the news it supplies is not tainted. Neither in what it gives, nor in what it does not give, nor in the mode of presentation, must the unclouded face of truth suffer wrong. Comment is free, but facts are sacred. “Propaganda,” so called, by this means is hateful. The voice of opponents no less than that of friends has a right to be heard. Comment also is justly subject to a self-imposed restraint. It is well to be frank; it is even better to be fair. This is an ideal. Achievement in such matters is hardly given to man. Perhaps none of us can attain to it in the desirable measure. We can but try, ask pardon for shortcomings, and there leave the matter.　　One of the virtues, perhaps the chief virtue, of a newspaper is its independence. Whatever its position or character, it should have a soul of its own.　　That is the path of self-respect—it is also the path of success. And what a work it is! How multiform, how responsive to every need—and every incident of life! What illimitable possibilities of achievement and of excellence!　　To the man, whatever his place on the paper, nothing should satisfy short of the best. It is here that ability counts and that character counts, and it is on these that a newspaper, if it is to be worthy of its power and duty, must rely.

It may be necessary to stop（）(每隔一定时间) in the learning process and go back to the difficult points in the lessons.

（）are liable to be stoten, pilfered or may damaged due to improper handing or stowage.

nder the law of competition, the employer of thousands is forced into the strictest economies, among which the rates paid to labor figure prominently. The price which society pays for t he law, like the price it pays for cheap comforts and luxuries, is great, but the advantages of this law are also greater than its cost—for it is to this law that we owe our wonderful material development, which brings improved conditions in its train. But, whether the law be benign or not, we cannot evade it；or the effect of any new substitutes for it proposed We can not be sure: and while the law may be sometimes hard for the individual, it is best for the race, because it insures the survival of the fittest in every department. We accept and welcome, therefore. as conditions to which we must accommodate ourselves, great inequality of environment；the concentration of business, industrial and commercial, in the hands of a few；and the law of competition between these, as being not only beneficial, but essential to the future progress of the race.

If the engine does not start on air, it may be due to （）