It is proposed that another meeting _______ to discuss how to give more support to the underdevelope

题干

It is proposed that another meeting _______ to discuss how to give more support to the underdeveloped area.

A：be held

B：have been held

C：was held

D：will be held

上一题下一题 0.0难度选择题更新时间:2019-03-06 04:34:28

微型吸尘器的直流电动机的内阻一定，当加上0.4V的电压时，通过的电流为0.4A，此时电机不转．当加在电动机两端的电压为2.5V时，电流为0.8A，这时电动机正常工作．则吸尘器的机械功率为多少？

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