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搜题
【单选题】
两轴在空间交错 90 0 的传动,如已知传递载荷及传动比都较大,则宜选用 _ 。A.
螺旋齿轮传动
B.
斜齿圆锥齿轮传动
C.
蜗轮蜗杆传动
D.
轮系传动
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知识点：
皮皮学刷刷变学霸
举一反三
【简答题】材料受外力作用破坏时的极限应力值就是材料的 。
【单选题】Part B Listening Comprehension Directions: In this part of the test there will be some short talks and conversations. After each one, you will be asked some questions. The talks, conversations and que...
A.
They had to carry sacks of coal up steep ladders.
B.
They had to crouch in tiny tunnels and dig the coal out.
C.
They had to pull trucks of coal along passage that were only a few feet high.
D.
They had to dig wider tunnels for women and children to work in.