离心泵内存有气体，使泵吸不上液的现象叫（）。
参考答案：气缚
Only when you have obtained enough data ________ come to a sound conclusion.
A．can you
B．you can
C．would you
D．you would
急进型高血压时，增生性小动脉硬化及坏死性细动脉炎主要发生于（）
A.大脑
B.肾
C.心
D.肾上腺
E.脾
