下列泵中，（）不是叶片式泵
A.混流泵
B.活塞泵
C.离心泵
参考答案：B
A story goes _______ Elizabeth Ⅰ of England liked nothing more than being surrounded by clever and qualified noblemen at court.
A．when
B．where
C．what
D．that
霍乱弧菌菌落在培养基中是何种颜色（）
A.白色半透明
B.灰白色
C.黄色
D.草绿色
E.淡黄色
