离心泵采用关小排出阀节流调节不会（）。
A.增加节流损失
B.降低效率
C.增加气蚀
D.降低轴功率
参考答案：C
Girl ____, she is much naughtier than a boy.
A．although she was
B．though she is
C．though was she
D．although was she
终端出口电眼报警的原因有（）。
A、电眼坏
B、分不开包
C、电眼位置未对准
