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【单选题】
正常标准直齿圆柱齿轮的齿顶高()。A.
与齿根高相等
B.
比齿根高大
C.
比齿根高小
D.
与齿根高相比,可能大也可能小
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【单选题】There are more than 100 million cars in the United States. A normal car gets less than 15 miles from each gallon of gas. It travels about 10,000 miles each year. In that time, it uses about 650 gallon...
A.
bus service
B.
subway service
C.
telephone
D.
airplane
【单选题】There are more than twelve students in the restaurant now.
A.
too much
B.
over
C.
around
D.
less than
【简答题】There are more than ______ human languages in use worldwide.
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