发电机定子升不起电压,最直观的现象是()。
A、定子电压表指示很低或为零;
B、定子电流表指示很低或为零;
C、转子电压表指示很低或为零;
D、转子电流表指示很低或为零。
参考答案:A
根据句意及首字母提示补全单词。
1. Kate's mother has gone a_______. She is in New York now.
2. Can you d_______ what is surfing and water-skiing in English?
3. In the past, my grandparents couldn't a_______ education for my father.
4. Keep working hard, and you will s_______ some day.
5. I'm very happy, because I live in a p_______ world, where there is no war.
计算题:某液体外加剂4.500g,烘干至恒重为1.450g,求该外加剂的固体含量。