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【单选题】
Why did David feel embarrassed when he greeted the boss of a company in Germany?A.
Because he forget to shake hands.
B.
Because he used his left hand to shake with the boss.
C.
Because he shook hands with his left hand in his pocket.
D.
Because he shook hands with the boss weakly.
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【简答题】压力调节容量控制通气的英文缩写是（）|呼气末正压通气的英文缩写是（）|持续气道正压通气的英文缩写是（）|适应性压力通气的英文缩写是（）A. PEEPB. ASVC. CPAPD. PRVCE. APV
【单选题】The demand for a good is more elastic if the
A.
good is a necessity.
B.
good has few substitutes.
C.
good is narrowly defined.
D.
supply of the good is plentiful.
E.
Both answers B and C are correct.
【简答题】呼气末正压的英文缩写是__________。
【单选题】If the demand for a good is elastic, then
A.
people do not change the quantity they demand when the price of the good changes.
B.
a change in price leads to a smaller percentage change in the quantity demanded.
C.
people substantially decrease the quantity of the good they buy if its price increases by a small percentage.
D.
a change in the quantity demanded is smaller than the change in price.
E.
the quantity demanded divided by the price exceeds 1.00.
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