In extreme weather conditions, either hot or cold, control of the air conditioning plant presents （） difficulties.

在植物病害中，真菌性病害的数量最多，有（）以上的病害是由真菌引起的。

根据什么把植物病害分为传染性和非传染性病害（）。

In extreme weather conditions, either hot or cold, control of the air conditioning plant presents （） difficulties.

Every deliberate act of wrongdoing by the master or any of the crew against the ship or cargo，without the authorization or privity of the Shipowner or his agent，is（）.

（）, or drum is used for hauling in or letting out the wires or ropes which will fasten the ship to the shore.

A salvor may be（）the whole or part of the payment due under Salvage Convention to the extent that the salvage operations have become necessary or more difficult because of fault or neglect on his part or if the salvor has been guilty of fraud or other dishonest conduct.

The （） is used for hauling in or letting out the wires or ropes.

Vessels must be（）valid certificate of nationality or certificated of registry or license.

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。

试从切断病害侵染循环的角度论述怎样才能防止或减少植物病害的发生。

逻辑运算符（AND、NOT、OR）的运算顺序是AND→OR→NOT。