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问题 单项选择题

以连续振动激发地震波震源是（）震源。

A.可控

B.气动

C.电火花

答案

参考答案：A

选择题
--- The patient looks much better.    is it that has made him      he is today?
--- Perhaps the special medicine and his family’s patient care.  
A．What; thatB．That; thatC．What; whatD．What; which
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选择题
盒子里有10个白球，6个黄球和3个红球，任意摸一个，摸到（　　）球的可能性最大．
A．红B．白C．黄
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