齿轮泵特别适合输送（）的液体。
A.有污水
B.润滑性能好
C.有固体粒
D.有清水
参考答案：B
The hunter calmly picked up his gun, took the aim and fired, ______ the beast. [ ]
A. bringing down
B. pulling down
C. falling down
D. putting down
为什么要进行文书立卷改革？
