【多选题】有关茶的历史和分类的说法,正确的有
C.
按制作季节,茶叶可分为春茶、夏茶、秋茶和冬茶
D.
唐代“茶圣”陆羽在《茶经》中记述了茶叶的起源、产地、种植方法等
【简答题】计算机病毒具有传染性、()、()和()等特点。。
【简答题】直流可逆电力拖动系统中电动机可以实现四象限运行,当其处于第一象限时,电动机作 ________ 运行,电动机正转,正组桥工作在 ________ 状态。
【单选题】Which of the following signs can NOT be found in a hospital?
【单选题】NJP传感器与药粉的间隙应在( )mm之间。
【单选题】气象上常用符号表示一些天气现象,如图所示的符号分别代表冰雹、小雪、雾和霜冻四种天气现象,其中通过液化形成的是? A: 冰雹 B: 小雪 C: 雾 D: 霜冻
【单选题】Which of the following is NOT true of the environments in which fossils are found?
A.
Very different environments can favor fossilization.
B.
There are few environments in which fossils are protected.
C.
Environments that favor fossilization always have similar characters.
D.
Environments that favor fossilization can sometimes support large populations of animals.
【单选题】男, 48 岁,与家人争吵后突发剧烈头痛,伴畏光、呕吐, CT 检查示蛛网膜下隙高密度出血征象。下列哪项征象阳性对其脑膜受激惹最有提示意义