对于有害废弃物不得直接倒入下水道或生活垃圾箱中,应置于指定地点,封闭完全,即可长时间存放。
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—________ is the sweater?—It's twenty dollars.
A. How many
B. How long
C. How much
D. How often
—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
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