【简答题】有半导体通以电流 I ,放在均匀磁场 B 中,其上下表面积累电荷如图所示.试判断它们各是什么类型的半导体?(填“P”或“N”,P型半导体中载流子为“正电荷”,N型半导体中载流子为“负电荷”。)
【单选题】– Do you want to say something to your teammates who didn’t win the match? -- Come on and never ______ hope.
【单选题】下列有关有机化合物的特性的叙述错误的是?
【单选题】What do the experts say you should NOT do when writing a personal statement for graduate studies.
A.
You should be authentic and personal – you want to be different from other applicants.
B.
You should be professional in how you describe your graduate study enterprise.
C.
You should make up experiences you've never had and write what you think the review committee wants to hear.
D.
You should show fluent English: get someone to proofread your work for spelling, punctuation, and grammar errors.
【单选题】下列对厌氧生物滤池的特点叙述错误的是()。
D.
AF适用于处理污染物主要是可溶性有机物的工业
【判断题】行业中存在很多竞争者,但是没有一个是其主导作用的,说明此行业竞争强度大。
【单选题】下列有关骨的特性与骨的成分之间的关系的叙述中,错误的是( )
B.
经过盐酸浸泡的鱼骨变得柔软,说明骨中含有有机物
C.
经过煅烧后的鱼骨变得脆硬,说明骨中含有无机物