The journey around the world took the old sailor nine months, _________the sailing time was 226 days.

A． of which

B． during which

C． from which

D． for which

电接点压力表在检定时，除了检查示值精度和信号误差外，还需检查（）

A.电气部分与外壳之间的绝缘电阻

B.弹簧管是否变形和泄露

C.电接点动、静触头是否良好