常用温度计玻璃泡里的液体通常选用酒精、煤油、水银等，但从未见_爱下问搜题

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问题填空题

常用温度计玻璃泡里的液体通常选用酒精、煤油、水银等，但从未见过温度计的玻璃泡里装水的。制造温度计不选用水的原因是_______________、_________________。

答案

水的反常膨胀；水的比热容大

填空题

短文填空：选择适当的单词填空。每词限用一次。（有两个多余的选项）

another, why, in English, job, hello, other, from, age, wants, asks

     Many Americans like to have their vacation in 1______ countries. One day an American woman comes to
China. This is her first time (次数) to China and she 2______ to make some friends there. She meets a Chinese.
This Chinese wants to talk 3______ with the American. When he sees her, he comes up, says "4______" to her,
then he begins his first talk with someone 5______ an English-speaking country.
     "How old are you?" the Chinese 6______.
     "I'm sorry. Please don't ask a lady (女士) about her 7______." answers the woman.
     The Chinese is surprised. He doesn't know 8______. Can you help him?

单项选择题

水泵的吸水管装置如图所示，已知流量Q=76m³/h，允许真空度[h_V]=6.2mH₂O，吸水管长l=10m，管径d=150mm，沿程阻力系数λ=0.04，局部阻力系数ξ_底阀=5.5，ξ_弯头=0.25，则水泵允许安装高度H_S=（）m。

A. 7.20

B.6.20

C. 5.52

D.5.12