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【单选题】
RP型磨煤机的磨辊为圆锥形,碾磨面较宽磨辊磨损极不均匀,磨损后期辊套型线极度失真,沿磨辊母线有效破碎长度变小,磨辊与磨盘间隙变小,对煤层失去碾磨能力,磨辊调整是有限度的,所以在运行中无法通过调整磨辊与磨盘间的相对角度和间隙来减轻磨损的()。(单选题)A.
均匀程度;
B.
不均匀程度;
C.
金属耗损量;
D.
增加使用寿命。
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举一反三
【单选题】Money spent on advertising is money spent as well as any I know of. It serves directly to assist a rapid distribution of goods at reasonable prices, thereby establishing a firm home market and so maki...
A.
he is firmly familiar with the cost of advertising
B.
everybody know well that advertising is money consuming
C.
advertising costs money like everything else
D.
it is worthwhile to spend money on advertising
【单选题】. He spent more than twice as much time on the problem _____ I spent on it .
A.
than
B.
as
C.
less
D.
so
【单选题】已知直线 过点(-3,1),且与直线x+4y-2=0平行,则直线 的方程为()
A.
x-4y-4=0
B.
4x-y-4=0
C.
4x-y+13=0
D.
x+4y-1=0
【单选题】______掌握着世界上最为先进的搜索引擎技术,也使中国成为美国、俄罗斯、和韩国之外,全球仅有的4个拥有搜索引擎核心技术的国家之一。
A.
百度
B.
网易
C.
搜狐
D.
腾讯
【单选题】I spent five yuan on this pen. =' I' spent five yuan buying this pen.
A.
by
B.
in
C.
for
D.
on
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