为检查管道及其附件的强度和严密性而进行水压试验时所选用的压力叫试验压力。
参考答案：对
As we all know, ________life is hard for any of us.If we want to live________happy life，we must work harder.
A．/；/
B．/；a
C．a；/
D．a；a
销售前议程的准备应包括哪些方面？
