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【单选题】
下列关于晶体的说法中，不正确的是 ①晶体中原子呈周期性有序排列，有自范性；而非晶体中原子排列相对无序，无自范性 ②含有金属阳离子的晶体一定是离子晶体 ③共价键可决定分子晶体的熔、沸点 ④MgO的晶格能远比NaCl大，这是因为前者离子所带的电荷数多，离子半径小 ⑤晶胞是晶体结构的基本单元，晶体内部的微粒按一定规律作周期性重复排列 ⑥晶体尽可能采取紧密堆积方式，以使其变得比较稳定⑦干冰晶体中（晶胞中的8个顶点和六个面心均有一个分子），一个CO 2 分子周围有12个CO 2 分子紧邻；所有的分子晶体都属于密堆积A.
①②③
B.
②③④
C.
④⑤⑥
D.
②③⑦
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【单选题】A rock ____ out of the ground tripped him. He fell and hit his forehead on a stone. That is how he got this big ____.
A.
protruding, bulge
B.
sticking, bulge
C.
sticking, swelling
D.
jutting, bulging
【简答题】完形填空。 A door was locked. A big stone came and hit the door. But he couldn't 1 it. Later a key came. He 2 the lock and the door opened. The stone was very 3 that the key could open it so easily. He ask...
【简答题】bulge; protrude; stick; jut; swell 5. A rock _______ of the ground tripped him. He fell and hit his forehead on a stone. That's how he got this big ______.
【简答题】请同学们点击附件,下载完成其中的练习作业。其中的一、二、三、四题均需完成(都附有参考操作步骤)。 做好后,将所做结果放在一个文件夹内,以附件形式压缩成包进行上传提交。 实验8-2 Excel数据的输入和工作簿的管理.rar
【单选题】A rock sticking out of the ground tripped him. He fell and hit his forehead on a stone。 That's how he got this big ______.
A.
bulging
B.
protruding
C.
sticking out
D.
jutting
E.
swelling
【简答题】设(A，+，·)是一个环，并且对于任意的a∈A，都有a·a=a，此环称为布尔环． 证明：(1)对于任意的a∈A，都有a+a=0，其中0是加法单位元素； (2)(A，+，·)是可交换环．
【单选题】He fell and hit his forehead on the stone. That’s how he got this big ____.
A.
bulging
B.
protruding
C.
sticking
D.
swelling
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