滚翻式舱口盖主要由()组成。①盖板;②水密装置;③滚轮装置;④导向曳行装置;⑤压紧装 发布时间:2018-01-30 05:45 │ 来源:www.tikuol.com 题型:单项选择题 问题: 滚翻式舱口盖主要由()组成。①盖板;②水密装置;③滚轮装置;④导向曳行装置;⑤压紧装置;⑥链条。A.①~⑤B.②~⑥C.①③~⑥D.①②④~⑥
题型:单项选择题 根据对话内容,从方框内选择合适的句子补全对话。( 有两项多余)A. I'll take it.B. Is it relaxing?C. How much is it?D. Can I have a look?E. I'm looking for a CD.F. What about this one?G. What kind of music do you like?A: What can I do for you, Madam?B: (1)____________A: Here are many CDs. (2)____________B: I like music that I can dance to.A: (3)____________ It's called Dance, Dance, Dance. The music is great for you to dance to.B: Great. (4)____________A: 15 yuan.B: (5)____________ Here is the money. 查看答案
题型:单项选择题 a、b、c、d、e、f、g为七种由短周期元素构成的粒子,它们都有10个电子,其结构特点如下其中b的离子半径大于e的离子半径;d是由极性键构成的四原子分子;试写出:(1)写出下列粒子的电子式: ①c__________;②d__________;③e__________;④a__________。(2)b与e相应元素的最高价氧化物对应水化物的碱性强弱比较为:__________>__________(用化学式表示)。(3)用电子式表示b元素与氧形成的化合物b2O的形成过程:_______________________________。 查看答案