—________ is the sweater?—It's twenty dollars.
A. How many
B. How long
C. How much
D. How often
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—What about these socks?—________ two dollars.
A. It's
B. They're
C. These are
D. Those are
—I like big hats. ________？—Yes, I have this one here.
A. It's five dollars
B. Can I help you
C. How can I do for you
Do you have one
在下列联轴器中，通常所说的刚性联轴器是
A. 齿式联轴器
B. 弹性套柱销联轴器
C. 弹性柱销联轴器
D. 凸缘联轴器
选择联轴器型号的依据是
A. 计算转矩、转速和两轴直径
B. 计算转矩和转速
C. 计算转矩和两轴直径
D. 转速和两轴直径
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