题目内容

材料力学研究的是构件受到的外力，理论力学研究的是构件受到的内力。

A. 对
B. 错

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材料力学研究杆件的哪几种变形形式？轴向拉压，扭转，弯曲这三种基本变形。

A. 对
B. 错

All odd numbers are integers(整数). All even numbers are integers. Therefore, all odd numbers are even numbers.

A. 对
B. 错

There are no dancers that aren't slim and no singers that aren't dancers. Therefore, all singers are slim.

A. 对
B. 错

A toothpick is useful. Useful things are valuable. Therefore, a toothpick is valuable.

A. 对
B. 错