On board ships, temperature maintenance can be made easier by increasing the ratio of recirculated to fresh air. Most air conditioning units have __for adjusting this ratio（）

A.catch plates

B.dampers

C.regulating valves

D.fans

答案

B、dampers

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第1题

According to the STCW Convention, when taking watch in port on ships carrying hazardous cargo in bulk, there shall be ready availability on board __（）

A.a qualified officer or officers, and ratings

B.a master and ratings

C.a master and a duly qualified officer

D.a master, a duly qualified officer and ratings when appropriate

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第2题

The SOLAS regulations do not apply to__. ①ships of war and troopships；②cargo ships of less than 500 gross tonnages；③ships not propelled by mechanical means；④fishing vessels（）

A.①②

B.②③

C.①②③

D.①～④

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第3题

Linux终端执行temp=world；echo hello $temp 上述命令执行的结果为（）

A.]. helloworld

B.]. hello$temp

C.]. hello world

D.[C]. hello

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