题目内容

Fill in the blanks with the expressions in the text.The odyssey years are certainly a very complicated 1._________ of life for young people. The odyssey years can 2.________ young people with enormous pressure to 3.____________. During these years, not only do these young people need to 4.__________ many difficulties, they also have to face many challenges from their parents.But, if you stay strong, be 5.______, and keep focused, someday you will look back and wonder at the 6.____________ as you passed through the odyssey years.

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直线运动导轨的截面形状主要有四种:矩形、 ,燕尾形和圆柱形,并可互相组合。

A. 三角形
B. 凹形
C. 凸形
D. 环形

双矩形组合导轨有制造简单及 的优点。

A. 调整简单
B. 精度保持性好
C. 承载能力大
D. 承受较大倾覆力矩

导向精度最高的导轨截面组合是( )。(A)(B)(C)

A. 矩形和矩形
B. 矩形和三角形
C. 三角形和三角形
D. 燕尾形导轨

开式导轨的特点是结构简单,但不能承受较大的。

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