His grandfather is over 85, ______ he is very healthy. [ ]
A. and
B. but
C. or
D. so
答案:B
患者男,34岁,因ED做血管活性药物试验,阴茎海绵体注射前列第尔10μg,5min后阴茎勃起坚硬,持续35min,结果说明患者为()。
A.心理性ED
B.动脉性ED
C.静脉性ED
D.神经性ED
E.需要进一步超声多普勒检查
高压开关柜内手车开关拉出后有何要求?