青霉素30万U/(kg·d)
A．肺炎链球菌脑膜炎B．脑膜炎双球菌脑膜炎C．金葡菌脑膜炎D．流感嗜血杆菌性脑膜炎E．结核性脑膜炎
参考答案：B
----Could you tell me _____? I must find him.
----Sorry. I have no idea. But he was here just now .
A．where Tom was
B．where has Tom gone
C．where can I find Tom.
D．where Tom is
离心泵效率是离心泵的重要性能参数，随着泵出口流量的增加，其效率（）。
A.先增大然后开始下降
B.增大
C.下降
D.不随流量而变化
