定值减压阀通常是保持（）稳定。
A．阀前压力
B．阀后压力
C．阀前后压差
D．A和B
参考答案：B
简述运输保险理赔的原则。
I will accept your apology, but not until after you have ______ your wrongs.
A．escaped
B．persuaded
C．admitted
D．refused
