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【单选题】
滤料应具有足够的机械强度和 性能,并不得含有有害成分,一般可采用石英砂、无烟煤和重质矿石。A.
水力
B.
耐磨
C.
化学稳定
D.
抗蚀
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【单选题】We drop a piece of metal into a jar full of water, the metal will float if it weighs less than______.
A.
an equal amount of silver
B.
an equal amount of gold
C.
all the water in the jar now
D.
the water that leaves the jar
【单选题】Transportation in the U.S. Railroads are paths of parallel metal rails that allow a wheeled vehicle to move more easily by reducing friction. Iron mils were first used in the early 1800s to guide hors...
A.
Y
B.
N
C.
NG
【简答题】A. cycled B. drove C. wheeled D. fled
【单选题】对文章中描写的一些说明,不正确的一项是 ( ) A .借书满架,偃仰啸歌,冥然兀坐,万籁有声。(动作情态描写,表现了作者在项脊轩修葺之后喜不自胜的情态) B .而庭阶寂寂,小鸟时来啄食,人至不去。三五之夜,明月半墙,桂影斑驳,风移影动,珊珊可爱。(景物描写,通过小鸟啄食,月白风清,花香袭人的美妙情景的描写,抒发了作者内心的得意喜悦之情) C . 语未毕,妪泣,余亦泣。(动作情态描写,它真实地...
A.
B.
C.
D.
D
【单选题】This kind of metal ______ well，and therefore the metal stick ______ into halves easily. [ ]
A.
is cut，is cut
B.
cuts，cuts
C.
is cut，cuts
D.
cuts，is cut
【简答题】间歇操作的设备要排列工艺 和 。
【单选题】Metal-wheeled chariots are the_________of the tanks of modern warfare.
A.
prototype
B.
original
C.
model
D.
sample
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