以下各泵可以做为压缩机润滑油泵的是（）。
A、柱塞泵
B、螺杆泵
C、齿轮泵
D、离心泵
参考答案：B, C
This is the last time that we _____ late for class.[ ]
A .had been
B. are
C. were
D. have been
咳吐痰多，胸闷体胖，或局部有圆滑包块，苔腻脉滑，属（）。
A.痰证
B.水停证
C.饮停胸胁证
D.饮邪客肺证
E.饮停心包证
