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【单选题】
下列进路中（）不属于敌对进路。
A.
同一到发线上对向的列车进路
B.
同一到发线上对向的调车进路
C.
同一到发线上对向的列车进路和调车进路
D.
同一咽喉区顺向重叠的调车进路
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【单选题】一圆柱直齿齿轮,模数为4,齿数为18,其齿顶圆直径为( )mm。
A.
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B.
80
C.
85
D.
90
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【单选题】已知一对正确安装的标准渐开线圆柱齿轮传动,其压力角ɑ= ,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
A.
18mm和54mm
B.
20mm和60mm
C.
72mm和216mm
D.
80mm和240mm
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【单选题】已知一对正确安装的标准渐开线圆柱齿轮传动,其压力角ɑ= 20 o ,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
A.
18mm和54mm
B.
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C.
72mm和216mm
D.
80mm和240mm
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【单选题】The black color is _______ this year. [     ]
A.
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【简答题】完形填空 Several years ago, a farmer owned some land along the sea. He advertised(征聘) for workers, but no one wanted to work for him. Most people didn't want to work there 1 they didn't like the bad storm...
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【单选题】已知一对对安装的标准渐开线圆柱齿轮传动,其压力角ɑ= ,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
A.
18mm和54mm
B.
20mm和60mm
C.
72mm和216mm
D.
80mm和240mm
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相关题目：
【单选题】一圆柱直齿齿轮,模数为4,齿数为18,其齿顶圆直径为( )mm。
A.
72
B.
80
C.
85
D.
90
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【单选题】已知一对正确安装的标准渐开线圆柱齿轮传动,其压力角ɑ= ,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
A.
18mm和54mm
B.
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【简答题】Situated in the South West of England, between Exeter and Plymouth, Torquay is one of the most popular holiday resorts in Britain. It provides a variety of entertainment, sports of every kind and cult...
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【简答题】阅读理解。 Most British telephone cards are just plain green, but card collecting is becoming a popular hobby in Britain and collectors even have their own magazine, International Telephone Cards. One reas...
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【单选题】已知一对正确安装的标准渐开线圆柱齿轮传动,其压力角ɑ= 20 o ,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
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C.
72mm和216mm
D.
80mm和240mm
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【单选题】The black color is _______ this year. [     ]
A.
the most popular
B.
most popular
C.
the popularest
D.
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【简答题】完形填空 Several years ago, a farmer owned some land along the sea. He advertised(征聘) for workers, but no one wanted to work for him. Most people didn't want to work there 1 they didn't like the bad storm...
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【简答题】B Snow can be very beautiful. When snow covers everything around you , the world looks like a “Winter Wonderland”. That is the name of a very popular song about winter. Richard Smith and Felix Bernard...
查看完整题目与答案
【简答题】___的___发明了活字印刷书。
查看完整题目与答案
【单选题】已知一对对安装的标准渐开线圆柱齿轮传动,其压力角ɑ= ,模数m=4mm,传动比i12=3,中心距a=144mm。则两齿轮的分度圆直径分别为
A.
18mm和54mm
B.
20mm和60mm
C.
72mm和216mm
D.
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查看完整题目与答案