浮筒式液位计的调校可分为干法调校和湿法调校。
参考答案：对
I enjoy my new life here. But I still miss my old friends from time to time. Here the underlined part means .
A．sometimes
B．at all times
C．always
D．Usually
用梯子作登高工具时，将梯子摆正，可以不需要专人扶梯（）
