硫喷妥钠静脉注入经多长时间后母胎浓度即相等()
A．1分钟
B．3分钟
C．2分钟
D．5分钟
E．4分钟
参考答案：C
The parents suggest_________in the hotel room but their kids were anxious to camp out
during the trip. [ ]
A. sleep
B. to sleep
C. sleeping
D. having slept
引起心绞痛与急性心肌梗死疼痛的原因是（）
A.挤压
B.出血
C.坏死
D.扩张
E.缺血
