压缩机设置防喘振回路可以使压缩机出口气量总是（）管网的气量，使压缩机始终处于稳定工作区。
A.小于
B.大于
C.等于
D.小于或等于
参考答案：B
As a war reporter, Jenny went through a lot of adventurous __________, which contributed to her rich _______ in her job.
A．experience; experience
B．experiences; experience
C．experience; experiences
D．experiences; experiences
承兑信用证的使用背景是什么？
