Why not stay at home _____ the road is so slippery after the heavy snow? [ ]

A. since that

C. then that

B. now that

D. after that

有静电接地要求的管道，各段管子间应导电。当每对法兰或螺纹接头间电阻值超过（）Ω时，应设导线跨接。

A．0.02

B．0.03

C．0.04

D．0.05