同有碳刷式微电机相比，对无碳刷式微电机的优点描述最准确的是

A．无火花

B．无火花，易发热

C．无火花，转子惯性大

D．无火花，电机效率高

E．无火花，电磁干扰小

A: Would you mind sending champagne and strawberries to my room at 1 a.m. please
B: ().

A. Yes, but the kitchen staff will leave at that time.

B. I’ll try, ma’am. But on Wednesday the kitchen staff will leave at midnight.

C. Not at all. But we only have apples.

D. Sorry, I can’t help you because it’s too late.