常见的把压力信号转换为电信号的（），一般也称为压力开关。

A．驱动装置 

B．检漏装置 

C．安全泄放装置 

D．信号反馈装置

He doesn't do his homework _____, though he has _____.[ ]

A. carefully enough , enough time

B. enough carelessly, time enough

C. carelessly enough, enough time

D. enough carefully,enough time