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【简答题】
如图题所示为一对互相啮合的渐开线直齿圆柱齿轮传动,已知主动轮1的角速度 , , n-n线为两齿廓接触点的公法线。试在该图上: (1)标出节点P; (2)画出啮合角;(3)画出理论啮合线; (4)画出实际啮合线;(5)在2轮齿廓上标出与1轮齿廓A1点相啮合的A2点;(6)计算 的大小。
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举一反三
【单选题】对于正截面受弯构件，下列说法正确的是（）。
A.
截面配筋率越大，构件的承载力和延性越好
B.
构件为适筋梁时，混凝土强度对受弯构件承载力影响比钢筋强度小的多
C.
双筋矩形因配有受压钢筋，因此截面不会出现超筋破坏
D.
双筋矩形截面中，受压钢筋增强了构件的承载力，但降低了构件的延性
【判断题】You should arrive at the airport in advance and hold the pick-up board waiting there.
A.
正确
B.
错误
【单选题】What should you do if you want to pick up food far from you?
A.
Stand up and grab it with stretching the hand.
B.
Wait until the plate reaches you.
C.
Ask another diner to hand the plate to you.
D.
Ask the waiter to give you another order.
【单选题】在钢合金化过程中,可显著提高钢抗氧化性和抗腐蚀能力,且用于调质结构钢中能在不降低塑性条件下提高钢的淬透性的合金元素是( )。
A.
Mn
B.
Ti
C.
Cr
D.
Al
【简答题】When eating a meal in China, people are expected to behave in a civilized manner (according to Chinese customs), pay attention to table manners and practice good dining habits. In order to avoid offen...
【简答题】Directions: Read the following passage. After reading it, you should give brief answers to the 5 questions that follow. The answers (in no more than 3 words) should be written after the corresponding ...
【简答题】Task 5 Directions : Read the following passage. After reading it, you should give brief answers to the 5 questions (No. 56 to No. 60) that follow. The answers (in no more than 3 words) should be writ...
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