风机在运行中，一旦出现喘振，要及时（）使之脱离喘振工况。
参考答案：防风
— Is Paul playing both soccer and tennis for the school?
— He ______. But now he has given up playing tennis.
A．is
B．has
C．was
D．had
启动外围设备前必须组织好通道程序，下列哪一项不是通道程序的控制部件
A．CCW
B．CSW
C．CAW
D．PSW
