How to create enough jobs for the laid-off workers is a(n)
A. oblem for which there is no simple solution
B. complex
C. internal
D. emergency
E. delicate
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Even children know about that and you think I’m ________ of that?
A.ignored
B.ignorant
C.ignorance
D.ignoring
第一布里渊区能量下压,第二区能量上扬,称为()。
A. 能级相近
B. 能级排斥
C. 能级分裂
多原子体系中电子不能再处于相同的能级上,这就使得原来相同的能级分裂成N个。
A. 对
B. 错
晶体中的电子波可认为是一种被周期性势场调制了振幅的平面波,称为布洛赫波。
A. 对
B. 错