中孕期超声发现的胎儿畸形有()①无脑儿②脑积水③脊柱裂④脐疝
A．①
B．①②
C．①②③
D．①②③④
E．②④
参考答案：D
—What's the matter with you?
—_____[ ]
A. I'm glad.
B.I have a cold.
C. I have something to do.
D. Don't worry.
下列因素中，能引起氧解离曲线右移的是（）
A.CO2分压降低
B.1.3-DPG降低
C.2，3-DPG降低
D.温度降低
E.pH值降低
