【判断题】用蒸汽杀青机时,若温度高于200℃,会使干茶色泽略暗
【单选题】关于柏氏矢量,下列说法错误的是 ________ 。
A.
用柏氏矢量可以表示位错区域晶格畸变总量的大小。
B.
用柏氏矢量可以表示晶体滑移的方向但不能表示滑移的大小。
C.
用柏氏矢量和位错线之间的位向关系可以判断位错的类型。
D.
对于一个位错来说,同时包含位错线和柏氏矢量的晶面是潜在的滑移面。
【单选题】妈妈要求小华必须完成作业后才能看动画片。这种做法符合( )。【2014年下半年真题】
【简答题】I’m Monty Don. Though I’m a host and writer now, I had an unhappy study experience actually. I changed 36 many times. I first went to school at five. None of my teachers or classmates liked me because...
【简答题】For the last 30 years, I have had violent physical reactions to certain noises. Everyday sounds make me want to hide, scream and put my fingers in my 36 . I feel unreasonable 37 to people about these ...
【简答题】A few weeks ago, our dog, which we had kept for more than ten years, had to be put down. First, a tumor on her stomach got worse, and she was very 36 . Then, the pain in her back got so bad that somet...
【单选题】关于花键连接,下列说法错误的是
A.
花键连接主要用于定心精度高、载荷大或经常滑移的连接
B.
三种花键连接中,基本尺寸相同时,渐开线花键连接承载能力最大,三角形花键连接承载能力最小
C.
矩形花键常用小径定心,渐开线花键常用齿侧定心
D.
三角形花键中内花键采用齿形角为45°渐开线齿形,外花键采用直线齿形
【单选题】I want to put ______in the basket.