《水土保持法》是什么时间颁布的?
参考答案:
1991年6月29日。
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