He can hardly swim, _______? [ ]
A. couldn't he?
B. can't he
C. could he
D. can he
答案:D
联系实际,论述教育行政机关设置和改革的原则。
图示两板用圆锥销钉连接,圆锥销钉的受剪面积为()。
A.A
B.B
C.C
D.D