离心泵进水口真空表指示()的吸水真空值。
A、出水管
B、吸水管
C、水泵
D、干管
参考答案:C
The players expected there ____ more free time before coming back to the country from abroad.
A.is
B.being
C.have been
D.to be
下列各腺体中,能够分泌调节糖类利用和转化的物质的是( )
A.甲状腺
B.肝脏
C.胸腺
D.胰岛