题目内容
George told me he could not come here because his mother is ill --____________
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()是一种通过电脑微波作用于人体的仪器。
The lateral distance between the original position where the vessel put the rudder one side and the farther lateral position where the vessel drifts away from the center of turning during the early stage of the turning defines ______.
以下哪种物质几乎不能通过扩散而通过生物膜
There is a man overboard. You must throw him a ____________.
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