同时具有控制、调节功能的风阀有9种，其中主要用于大断面风管的风阀是（）。 A.复式多 发布时间：2017-06-10 12:12 │ 来源：www.tikuol.com 题型：多项选择题 问题： 同时具有控制、调节功能的风阀有9种，其中主要用于大断面风管的风阀是（）。A.复式多叶调节阀B.平行式多叶调节阀C.对开式多叶调节阀D.菱形多叶调节阀
题型：多项选择题 阅读理解。 Recently a really strange thing happened at Wuhan Liangdaojie Middle School in Hubei. Over 600Junior 1 and 2 students at the school took part in a "caring for an egg like a baby" activity. They were asked to keep an egg close at hand for a month without breaking it. "It's hard for parents to bring up their children but many students take their parents' love for granted.(把…当作理所当然)," said Liu Kang, the school's director. "We wanted them to learn that lesson bytaking care of an egg as a baby." Li Mingxuan is one of the students. His egg didn't break during the month, but he felt exhausted. "Youhad to put so much attention to it," said the 13-year-old boy, "I now understand how much my parentshave done for me. I'll prepare them a glass of milk to help them sleep better every night." Not everyone was as lucky as Li. More than 450 of the 600 students broke their eggs. Yan Yueming broke his egg in just five days, which made him very frustrated. He said, "I can't imagine how sad my parents would be if there was something wrong with me, their 'egg'!" I want to return theirlove and I'll help them with chores every day." promised the 13-year-old boy. 1. Li Mingxuan felt very ______ during this month. [ ]A. frustrated B. sad C. exhausted D. happy 2. ______ were broken in the month during this activity. [ ]A. No eggs B. All the eggs C. 600 eggsD. More than 450 eggs 3. According to this article, we know after this activity Yan Yueming will ______. [ ]A. help his parents with chores every day B. prepare his parents a glass of milk to help them sleep better C. not break the eggs any more D. be glad to help others 4. The aim of this activity is to ______. [ ]A. teach the students to be more careful B. teach the students the eggs are fragile (易碎的) C. teach the students to understand their parents D. teach the students to love their teachers 5. What can we infer (推断) from the article? [ ]A. The students always argue with parents at home. B. The students don't study hard at school. C. The students don't like this activity. D. The students learn to love their parents through this activity. g 查看答案
题型：多项选择题 Mother often does the laundry on Sunday.A．does the cleaningB．washes clothesC．goes shoppingD．does some reading 查看答案
题型：多项选择题 计算题：在列管换热器中，用热水加热冷水，热水流量为4500kg/h，温度从95℃冷却到55℃，冷水温度从20℃升到50℃，总传热系数为2800W/（m2.℃）。已知热水和冷水的比热分别为4181J/（kg.℃）和4174J/（kg.℃）。求：（1）冷却水流量。（2）两流体作逆流时的平均温度差和所需要的传热面积。 查看答案