We don't agree with him ________ some ways. [ ]
A. at
B. on
C. in
D. of
答案：C
心血管和外周血管造影给药的方法是（）
A.经胃肠灌注
B.经直肠灌注
C.皮下注射
D.静脉注射
E.口服
简述按照电流制式电器如何分类？
