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【单选题】
某三相步进电动机，转子40个齿，若其最大转矩为1N/m，则其三相六拍运行时启动力矩的N/m数为（）
A.
1
B.
0.5
C.
0.707
D.
0.866
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B.
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D.
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相关题目：
【判断题】波峰焊中如果肋焊剂喷涂量过多容易造成焊点不全。
A.
正确
B.
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