胎儿宫内窘迫最明显的临床征象是（）。
A.胎动减弱
B.羊水粪染
C.胎儿头皮血气分析pH<7.20
D.胎心率变化
E.NST基线平直
参考答案：D
We want to buy the same computers are being used in your office．
A．which
B．as
C．that they
D．as they
导管
