（）在刚性迅速增加之前，伸长变形已达50%，但在变形达到50%之后

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问题单项选择题

（）在刚性迅速增加之前，伸长变形已达50%，但在变形达到50%之后，刚性迅速增加并使韧带突然破坏。

A、前交叉韧带

B、黄韧带

C、髌韧带

D、跟腱

答案

参考答案：B

填空题

用所给单词的适当形式填空。

1. The children were ________ because they didn't get Christmas presents. (happy)

2. How can you make yourself ________ if you cannot express yourself clearly? (understand)

3. December is the _______ month of the year. (twelve)

4. The doctor's ________ made all of them sad. (dead)

5. I think this dictionary is ________ for your study. (help)

单项选择题

轴承压装后，左右旋转（）圈，转动须灵活，不得卡阻，且须进行磨合测试。

A.1～2

B.2～3

C.3～4

D.3～5