动力式泵有( )。
A．离心泵
B．混流泵
C．隔膜泵
D．旋涡泵
参考答案：A,B,D
In the south no one spoke to you at bus stops or in the markets, _____ here people smiled at you and said a few words.
A．although
B．so
C．whereabouts
D．whereas
Moving-BarTechnique是指（）
A.独立准直器技术
B.非独立准直器技术
C.孔雀系统准直器技术
D.棋盘式准直器技术
E.条形挡块移动技术
