同一片半导体基片上,分别制造P型半导体和N型半导体,在它们的交界面处形成的特殊区域称为PN结。
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A mixture of selected funds is a(n) __________ choice for future security and return on investment.
A. take place
B. comply with
C. as a whole
D. optimum
Steel is produced by _________ iron ____carbon.
A. combining with
B. comply with
C. as a whole
D. optimum
The concert _________________ next Thursday.
A. will combine with
B. will comply with
C. as a whole
D. will take place
Anyone who does not _____________ these regulations will be asked to leave.
A. combine with
B. comply with
C. as a whole
D. take place
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