Which of the valves listed should be used either in the fully opened or the fully closed position?（）

If the engine is naturally aspirated, or is a small high-speed type with a centrifugal turbocharger, the period of valve overlap（）,ie when both valves are（）, will be and the exhaust valve will close some 10°top dead canter（）.

Topic 6：Can shopping vouchers increase consumption?　　Questions for Reference:　　1) To stimulate consumption, which is more effective, tax reduction or shopping vouchers?　　2) What are the major purposes of issuing shopping vouchers?　　3) In what way can the shopping vouchers best be distributed? Shall every citizen be given the same amount of shopping vouchers or should the vouchers be limited to the lower-income people only?

确定参加部队院校考试的考生有哪些情形，不得报考院校招生考试？（）

This shop will be closed for repairs ______ further notice.

Scientists say it may be five or six years _____ this medicine is tested on human beings.

Is this（）longer or shorter?

It will be a relief over the death of a friend or a relative if the friend or relative dies from ______.

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

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

Effects which are dutiable or subject to prohibitions or restrictions should be declared in （）.

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