问题
选择题
His has changed but he has kept the fine qualities of a scientific researcher.
A．state
B．status
C．station
D．statue
答案
答案：B
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His has changed but he has kept the fine qualities of a scientific researcher.
A．state
B．status
C．station
D．statue
答案：B
时（T为交流的周期），原线圈中的电流瞬时值为0.03A．变压器的原、副线圈的匝数比为（ ）
：3