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【判断题】
泵浦(pumping)是指给激光工作物质提供能量使其形成粒子数反转的过程。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】If I ask you what constitutes 'bad' eating, the kind that leads to obesity and a variety of connected diseases, youre likely to answer, 'Salt, fat and sugar.' Yet thats not a(n) 【C1】______answer. We d...
A.
possible
B.
adequate
C.
familiar
D.
insufficient
【单选题】A constant supply of nutrients for body requires ______.
A.
enough vitamin only
B.
a variety of foods
C.
a rich breakfast
D.
enough food
【单选题】Research has produced many new _______ that will be used in the manufacture of a variety of goods.
A.
hypotheses
B.
summaries
C.
synthetics
D.
emphases
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