钢丝绳的安全系数与使用场所无关。()
A、正确
B、错误
参考答案:B
It's important _____ the violin well. [ ]
A. of him to play
B. for him to play
C. of him playing
D. for him playing
用差压计测量液位时,要根据()的高低和()及隔离液的性质,来考虑对差压计进行零点迁移。