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【单选题】
脉压增大主要见于A.
心包积液
B.
主动脉瓣狭窄
C.
主动脉关闭不全
D.
甲状腺功能减退
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【简答题】请将下列英文句子翻译成中文:It is their plasticity at certain temperatures , which gives plastics their main advantage over many other materials .
【简答题】请将下列英文句子翻译成中文: He is quick to criticize his staff and hates to be quesitoned about decisions he has made.
【简答题】请将下列英文句子翻译成中文: (1) Efficiency and mechanical advantage are used to gauge the performance of mechanical machine .
【简答题】Many scientists have been probing psychological problems（ ）
【简答题】For years scientists have been worried about the ___________ of air pollution on the earth’s natural conditions. A. effect B. result C. account D. cause
【单选题】For years scientists have been worried aboutthe ___________ of air pollution on the earth’s natural conditions.
A.
effect
B.
result
C.
account
D.
cause
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