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【单选题】
已知一渐开线标准直齿圆柱齿轮,齿数Z=25 ,齿顶高系数 =1 ,直径 =135 ,则其模数大小 。A.
2mm
B.
4mm
C.
5mm
D.
6mm
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A.
live up to
B.
live on
C.
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A.
蒸馏水
B.
0.1%醋酸
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A.
蒸馏 水
B.
B ． 0.1% 醋酸
C.
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D.
D ． 0.02% 味喃西林
E.
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A.
the settlers must be involved in the forest loss in the settlement areas
B.
deforestation in the settlement areas occurs before settlers arrive
C.
satellite images are the strongest evidence in the deforestation research
D.
about half of the trees in the settlement areas have been lost
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A.
can’t pay
B.
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C.
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D.
can afford
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