制冷设备布置应使管路尽量短,另外还有一定的管径要求。目的是减少()。A.压力 B.重

题型:单项选择题

问题:

制冷设备布置应使管路尽量短,另外还有一定的管径要求。目的是减少()。

A.压力

B.重力

C.动力

D.阻力

考点:制冷工考试制冷工考试题库
题型:单项选择题

一定量的CuS和Cu2S的混合物投人足量的硝酸中,收集到气体V L(标准状况),向反应后的溶液中(存在Cu2+和SO42-)加入足量的NaOH溶液,产生蓝色沉淀,过滤,洗涤,灼烧,得到24.0 g CuO。若上述气体为NO和NO2的混合物,且体积比为1∶1,则V可能为

A.18.0 L

B.27.0 L

C.31.4L

D.33.6 L

题型:单项选择题

阅读理解。

     I have never taken cooking classes. I learned cooking from my mother because she was really interested

in teaching me how to cook. The main reason for this was that when my mother got married, she didn't know

how to cook anything, not even an egg. My grandmother never allowed her to stay in the kitchen when she

was cooking.

     My mother did not start to cook until she was 25 years old. In the beginning, it was very hard for her.

Therefore, she had to take cooking classes to prepare our meals. After having that experience, she decided

to teach me how to cook because she didn't want me to have the same experience.

      I remember when I was seven years old, and my mother was cooking, I was with her in the kitchen

enjoying cooking. I always helped her. Sometimes we prepared meals that my mother already knew how to

make, and sometimes we prepared them from recipes. Nowadays, I am really thankful for that experience

of people, it doesn't matter.

      I will do the same with my children because I don't want them to have the same experience as my mother.

If one day I am not with them, I want to be sure that they can carry on their lives without me.

1. The writer's mother learned cooking _______.

A. from the writer's grandmother

B. all by herself

C. by taking cooking classes

D. from cooking books

2. The writer's mother taught the writer how to cook because _______.

A. she wanted the writer to be more independent (独立)

B. the writer was interested in cooking

C. she thought it a must for a woman to learn

D. she needed more help when she was cooking

3. The underlined word "recipes" in this passage most probably means _______.

A. instructions on how to prepare food

B. experiences of cooking food

C. some well-known cooks

D. she needed more help when she was cooking

4. We can learn from the passage that the writer's children will _______.

A. hate cooking

B. learn cooking

C. teach cooking

D. forget cooking

5. The writer must think cooking is _______ to learn in life.

A. interesting

B. difficult

C. enjoyable

D. important

题型:单项选择题

近代以来,中国传统文化在与西方文化交融碰撞中,孕育出了许多富有民族传统特色的新生事物,下列属于中西交融的是

 

①改良旗袍     ②中山装         ③京剧           ④四合院

A.①②        B.①②④      C.②③④     D.①②③④

题型:单项选择题

下列哪项属于稳定型脊柱骨折()

A.Chance骨折

B.两侧腰2-34横突骨折

C.椎体骨折脱位

D.腰4-5椎板、关节突骨折

E.第1颈椎半脱位

题型:单项选择题

对于W3Jmail邮件发送组件,如果信箱是jjshang99@163.com,密码是123456,发信服务器是smtp.163.dom。请写出执行发送邮件的语句()

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