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着装要求:
A、工装整洁,不要敞怀
B、在室内可以戴墨镜,
C、工作时禁止穿拖鞋
D、禁止挽裤腿
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一对圆柱齿轮传动,小齿轮分度圆直径d1=50mm、齿宽b1=55mm,大齿轮分度圆直径d2=90mm、齿宽b2=50mm,则齿宽系数 。
A.1
B.3
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Read the scenario. Is A possibly a male or a female? A and B got married a few years ago. A is the life and soul of the party when they go out, chatting away loudly and seems interested in all topics. But at home A does not have much to say and B does most of the talking.
A、A is possibly male.
B、A is possibly female.
A.
B.
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