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【单选题】
道岔的号数或辙叉号码是指道岔辙叉角的( )。
A.
正切值
B.
余切值
C.
正弦值
D.
余弦
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A.
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B.
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C.
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A.
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B.
可以与乙酰胆硷结合
C.
可以与毒蕈硷结合
D.
存在于神经肌肉接头的终板模上
E.
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A.
government
B.
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C.
importer
D.
exporter
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A.
has been to         
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