我国与欧洲国家直接往来始于[ ]
A．张骞
B．班超出使西域
C．欧洲商人来汉
D．大秦安敦王朝使臣访问东汉
答案：D
Which of the following assessments indicates fetal distress
A. Fetal scalp pH of 7.14.B. Fetal heart rate (FHR) of 144 beats/minute.C. Acceleration of FHR with contractions.D. Long-term variability.
胎儿时期下列哪个系统发育最早
A．呼吸
B．循环
C．神经
D．泌尿
E．内分泌
