单项选择题

公园道路系统的骨干是（）
A、支路
B、主路
C、小路
D、游步道

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判断题

电机旋转的速度可以通过其后加装的码盘传感器计算得到。

单项选择题

An employee is paid on a piecework basis. The basis of the piecework scheme is as follows:with only the additional units qualifying for the higher rates. Rejected units do not qualify for payment.During a particular day the employee produced 210 units of which 17 were rejected as faulty.What did the employee earn for their day's work?A、54.00 C、63.00

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