问题
单项选择题
离心式压缩机设置防喘振阀，即为（）阀门防止与消除喘振。
A.放空
B.进气控制
C.回流控制
D.排气控制
答案
参考答案：C
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离心式压缩机设置防喘振阀，即为（）阀门防止与消除喘振。
A.放空
B.进气控制
C.回流控制
D.排气控制
参考答案：C
Dear mother, Today is Sunday. I ____ go to school. I stay ____ home. I'm writing to you now. Every day, I go to school ____ seven thirty in the morning. We have four lessons in the morning. We read and write Chinese ____ school. ____fifty-five students in my class. Four of them ______ Americans（美国人）. The other（其他的） students are Chinese. The Chinese people are friendly（友好的）. Now I have ____ Chinese friends. My classmates are all my friends. They teach ____Chinese. I can ____ a little Chinese now. Please ____ worry about me. Yours, Kate
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