试题与答案

联合循环形式有燃气轮机、蒸汽轮机同轴推动一台发电机的()联合循环,也有燃气轮机、蒸汽

题型:单项选择题

题目:

联合循环形式有燃气轮机、蒸汽轮机同轴推动一台发电机的()联合循环,也有燃气轮机、蒸汽轮机各自推动各自发电机的()联合循环。

A、单轴,多轴

B、简单,复杂

C、整体,简单

D、主要,辅助

答案:

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1995年,美国的两位学者是利用直径为26米的射电望远镜寻找由浩瀚宇宙深处发出的未知讯号。然而,至今还未发现具有已接收讯号特征的电波源,且在这些电波的方向上,也没有特异的星体存在。 “未发现具有已接收讯号特征的电波源”这句话的意思是( )。

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B.已经接收到讯号但不能确定其电波源

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