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【单选题】
According to the regulations，to prevent excessive pressure buildup in cargo tanks containing LFG，they are fitted with（）.A.
pressure vacuum relief valves
B.
excess flow valves
C.
safety relief valves
D.
flame screens
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举一反三
【单选题】Which of the following sentence adopts a diffferent rhetorical device from the rest three?
A.
The world is watching closely what the White House will do next.
B.
I, too, felt the compulsive hand of nature and began to find that pointing out contradictions could be costly as well as fun.
C.
Democracy favors the vote rather than the bullet.
D.
It never occurred to him that the pen could be mightier than the sword.
【单选题】Which of the following sentence has the different meaning from the other three?
A.
You are telling me.
B.
You may well say so.
C.
You can say that again.
D.
That's not saying very much.
【简答题】化合酸( C.A. )
【多选题】以下关于总效用和边际效用说法正确的是
A.
总效用是消费者在消费商品时所感受的总满足程度
B.
边际效用是消费者增加一单位某种商品的消费所增加的满足程度
C.
边际效用递减时，总效用递减
D.
边际效用大于零时，总效用递增
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