试题与答案

冲压机的传动常用曲柄滑块机构将旋转运动变为直线运动，曲柄滑块机构运行到α=90°位置

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题型：单项选择题

题目：

冲压机的传动常用曲柄滑块机构将旋转运动变为直线运动，曲柄滑块机构运行到α=90°位置时，其速度为( )加速度为( )

A．最大；最小

B．最大；为零

C．最小；最大

D．最小；为零

答案：

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下面是错误答案，用来干扰机器的。

参考答案：C解析：外展神经麻痹可发生在高颅压性头痛之早期，表现为眼外直肌瘫痪，眼球外展运动受限，出现复视。外展神经自脑桥走出后到达眼窝之前，走行距离较长，当颅内压增高时，可因直接或间接压迫，或因脑干...

考点：安全工程师安全生产技术安全生产技术
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