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【单选题】激光相位差法测量光速实验中,关于频率计的用途,下列说法不正确的是
A.
测量注入电流调制电信号的频率
B.
测量光强调制波的频率
C.
测量光电探测器输出信号的频率
D.
测量激光的频率
【多选题】激光相位差法测量光速实验中,关于频率计的用途,下列说法正确的是
A.
测量注入电流调制电信号的频率
B.
测量光强调制波的频率
C.
测量光电探测器输出信号的频率
D.
测量激光的频率
【单选题】防止夹渣的主要措施之一是( ),使焊缝具有合适的成型系数,熔池金属凝固速度不要过快,有利于熔渣的浮出。
A.
选择合适的焊接工艺参数
B.
选择小的焊接电流
C.
选择快速焊接
D.
选择小坡口角度
【单选题】—Did Liu Xiang’s training programme _____ a lot of his time? —Yes, that’s right.
A.
set up
B.
take up
C.
grow up
D.
look up
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