单项选择题

在螺纹连接图中，当剖切平面通过螺杆（）时，螺栓、（）、螺钉、螺母和垫圈应按未剖切绘制。

A、轴线、销
B、轮廓线、键
C、轴线、螺柱
D、轮廓线、螺柱

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单项选择题

（）at in this way,the present economic situation doesn´t seem to gloomy.

A、Looking
B、Looked
C、Having looked
D、To look

It usually takes a student four years to earn a bachelor’s degree in arts or science.

答案： It usually takes a student four years to earn a bachelor’s d...