【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...
【简答题】Reading is an activity that people enjoy a lot in their free time. Some like reading newspapers and o________小题1: enjoy novels or comic(喜剧的) books. My favourite books are t________小题2:about the lives ...
【判断题】在一阶RC电路中,若C不变,R越大,则换路后瞬态过程越长。
【单选题】Books are for reading, but man must bring to their reading a desire to learn and a power of absorbing. Reading should be active, not passive. (79)When students first go to a library, they may be at a ...
A.
read as many books as he can
B.
try to read books on all the different subjects
C.
only read books on subjects that interest him
【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 4 MgO 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...
【简答题】当在一阶 RC 电路中,若 C 不变, R 越大,则换路后过渡过程越 。
【单选题】The ________ meeting _______ at two o'clock in the afternoon.