注水变频柜的组成:变频器、断路器、接触器、继电器、()、压力变送器。
A.逆变器
B.整流器
C.PID压力调节表
D.控制器
参考答案:C
补全对话,每空一词。
Clerk: Can I help you?
Mary: Yes, 1 . I want a sweater.
Clerk: What 2 do you want?
Mary: Blue.
Clerk: Here you are.
Mary: 3 ______ 4 ______ is it?
Clerk: Nine dollars.
Mary: I'll 5 ______ it. Thank you.
Clerk: You're welcome.
企业按照销售百分率法预测出来的资金需要量,是企业在未来一定时期资金量的增量。 ( )