设计电动机时,常常把最高效率点设在额定功率的()。
A.70%~200%
B.70%~150%
C.70%~100%
D.70%~90%
参考答案:C
On ____ Friday when Tom was having an art lesson, as he had no color pencils with him, he
drew _____ blue sun with his pen. [ ]
A. 不填; the
B. 不填; a
C. the; the
D. a; a
学校德育对政治、经济、文化发生影响的功能即指( )
A.发展性功能
B.个体性功能
C.教育性功能
D.社会性功能