【简答题】____ Cats are clean and do not require much attention. ____ There are definite advantages to having a cat as a pet. ____ Cats like living indoors and are safe to have around children. ____ Cats are in...
【多选题】关于热缺陷的说法正确的是
A.
晶体中粒子的热运动能量也和气体中一样,也有一定的统计分布。
B.
在一定温度下,总有一些粒子具有足够的能量脱离平衡位置而形成缺陷。
C.
扩散的机制是由于热缺陷的存在及其在晶体中能够运动,就可以使晶体中的粒子由一个地方移到另一个地方。
D.
有电场时离子晶体之所以能够导电,也是由于热缺陷的存在和运动,使离子晶 体中的离子能够在电场作用下移动的缘故。
【单选题】能够根据音乐的性质与表现手段想象音乐形象与情节的发展,并能够用舞蹈、戏剧表演、诗歌等多种方式创造性地表现, 是()幼儿音乐欣赏活动的年龄阶段目标。
【简答题】阅读理解。 Cats and dogs are both popular pets. Cat owners think that cats are nicer pets in some ways. Cats are cleaner, first of all. They keep themselves clean, and they do not make the house dirty. Cat...
【单选题】能够根据音乐的性质与表现手段想象音乐形象与情节的发展,并能够用舞蹈、戏剧表演、诗歌等多种方式创造性地表现, 是()幼儿音乐欣赏活动的年龄阶段目标
【简答题】Which sentence might work well as a thesis statement in the following pairs? What is the problem, too factual, broad or vague? 1. a. From the time I was a young child, I have always had at least th...
【单选题】溶液对于生命活动必不可少,下列有关说法正确的是 [ ]
B.
热糖水降低温度后有固体析出,则原热糖水一定是饱和溶液
C.
喝下汽水后,常会打嗝,说明气体的溶解度随温度的升高而减小