问题
问答题 简答题
什么是负压？
答案
参考答案：
当绝对压力小于大气压力时，两者差值为负称为负压。
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什么是负压？
参考答案：
当绝对压力小于大气压力时，两者差值为负称为负压。
| 根据短文内容用框格内的适当形式填空。 | |
the 3____ . The doctor 4____ over Mrs.Brown for a few 5____ , then the doctor said, "I'm afraid you are too fat.""Too fat?"asked Mrs.Brown. The doctor said Mrs.Brown 6____ too much food and she didn't 7____ much exercise. Mrs.Brown 8____ the doctor what to do. The doctor said, "If you want to be 9____ and keep 10____, you have to eat less food." |