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。
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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
Three pencils cost the same as two erasers. Four erasers cost the same as one ruler. Therefore, pencils are more expensive than rulers.
A. 对
B. 错