有两个容积相等、质量都等于0.5 kg 的瓶子，各盛满水和某液体_爱下问搜题

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问题计算题

有两个容积相等、质量都等于0.5 kg 的瓶子，各盛满水和某液体，盛水的总质量为4.5 kg ，盛某液体的总质量是3.7 kg 。问：

(1) 瓶子的容积是多少？

(2) 该液体的密度是多少？

答案

(1)V_溶＝4 ×10^-3 m³

(2)ρ_液＝0.8×10³ kg/m³

完形填空

短文填空：
用下列所给词的适当形式填空，使短文完整正确。

health , help, much , time, run, relax, away, keep，become, active

Do you like running? Running is __小题1:__one of the most popular activities these days. Many of us run for our___小题2:___. Doctors say many of the health problems come from such bad habits as eating too ___小题3:___,drinking too much, smoking, staying up late and not having enough exercise. Doctors tell us, “Eat less, don’t smoke, have enough sleep and exercise more.” Running is good exercise because it __小题4:___build a strong body. It also helps many people lose weight. One 25-year-old woman teacher runs for half an hour in the morning five ___小题5:__ a week. She runs to lose weight. “I feel comfortable and I’m not fat any more,” she says.
Running is good for health in other ways ,too. Many __小题6:__ say running makes some small health problems go _小题7:___. “Running is my doctor,” says one man.
Running can also help people to __小题8:__. “After school, I like to run for ten minutes. Then I feel _小题9:__ and energetic,” says Yang Li, a middle school student. So today men and women of all ages enjoy running.
Do you want to __小题10:__fit? Come on! Let’s join in the running!

判断题

在人员疏散过程中，以及疏散到横通道后，为了便于乘务人员进行引导组织，列车乘务人员应配备便携式扩音器。