题目内容

Practice is the sole () for testing truth.

A. estimate
B. scale
C. criterion
D. circulation

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These programs will () new markets for farmers.

A. open down
B. open up
C. open on
D. open in

The lowest () would put the worth of the jewel at $ 200.

A. criterion
B. estimate
C. proportion
D. circulation

轴流泵的叶轮一般安装在水面（）

A.以下
B.以上
C.表面位置
D.不一定

轴流泵的特点是（）

A.流量小、扬程小
B.流量大、扬程小
C.流量小、扬程大
D.流量大、扬程大