笼型电动机和同步电动机选择起动方式时,如条件允许优先采用的起动方式为()。
A.转子串频敏变阻器起动
B.星—三角起动
C.全压起动
D.变频起动
参考答案:C
选择shadow或shade并用其适当的形式填空 .
①Sometimes people will get frightened by his own____________ especially at night.
②After a long walk, they needed to find some____________ and have a rest.
思维反映的是()
A.过去的经验
B.过去感知过的事物的形象
C.事物之间的内在联系
D.人的愿望