心脏的传导系统包括（）
A.普肯耶纤维网
B.窦房结
C.希氏束
D.结间束
E.房室结
参考答案：A, B, C, D, E
—Would you help me plan my vacation?
—________. [ ]
A. All right.
B. No, let's not.
C. Thank you.
D. Of course not.
低体重儿出生3天内全血血糖低于( )
A．1.11mmol/LB．1.67mmol/LC．1.44mmol/LD．1.55mmol/LE．1.66mmol/L
