三相异步电动机串电阻降压启动的目的是提高功率因数。
参考答案：错
To have a dinner at a restaurant on the Eve of the Spring Festival, you need to reserve the restaurant
months before it, ____? [ ]
A. mustn't you
B. didn't you
C. don't you
D. needn't you
各级人民政府( )依法履行对政府采购活动的监督管理。
A．商务部门
B．财政部门
C．税务部门
D．审计部门
