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单项选择题

采用比例画法绘制螺栓连接，若螺栓公称直径为d，则螺栓头部正六边形外接圆直径约为（），螺纹长度约为（），螺栓头部厚度约为（）。

A.7d
B.8d
C.9d
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相关考题

单项选择题
The following information relates to Question 7 and 8. A company operating a standard costing system has the following direct labour standards per unit for one of its products: 4 hours at $12.50 per hour Last month when 2,195 units of the product were manufactured, the actual direct labour cost for the 9,200 hours worked was $110,750. What was the direct labour rate variance for last month?
A、$4,250 favourable
B、$4,250 adverse
C、$5,250 favourable
D、$5,250 adverse
A.50
判断题
生物除磷过程中不需要提供有机碳源。
未知题型
粉路图中，2S表示第2道尾磨。
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