使应急电源充电回路与电池之间、电池与电池之间连线断线，应急电源应在()s内发出声、光故障信号，声故障信号应能手动消除。

A.20

B.40

C.60

D.100

15.At the meeting, a proposal that he should take charge of the project _____.

A．put forward

B．came up

C．came up with

D．Showed