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【简答题】
叩诊检查时，根据音响的频率、振幅的不同临床上可将叩诊音分为（）、（）、（）、（）和（）。
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反馈参考答案：
举一反三
【简答题】MRI成像的主要优势有哪些?
【单选题】Consider the following problems: Overcrowded public highways, overfishing in the ocean, polluted air, and the near-extinction of the wild rhinoceros. What do these problems have in common?
A.
Private markets could easily solve them if governments left the markets alone.
B.
They would all go away if the government sponsored an intensive public-information campaign.
C.
They are all the result of a failure to establish clear property rights over something of value.
D.
They are all the result of a failure of corrective taxes.
【单选题】What do these wild birds do to help humans?
A.
Make sounds to meet humans.
B.
Use smoke to get rid of the bees.
C.
Reward humans with pieces of nest.
D.
Take humans to find honey in the nest.
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