哪项代码是机顶盒无线问题()
A. 1901
B. 1902
C. 1903
D. 1302
Eithertheshirtsorthesweater()agoodbuy
A. is
B. has
C. are
D. was
Everysocietyhasitsownpeculiarcustomsand()ofacting.
A. attitudes
B. behavior
C. ways
D. means
在有源逆变电路中,逆变角的移相范围应选()为最好。
A. =90º∽180º
B. =35º∽90º
C. =0º∽90º