下列哪项不属于孕晚期保健的内容()
A、应注意补充营养,定期产前检查,及时发现并矫正异常胎位
B、注意防治妊娠并发症
C、进行唐氏筛查
D、监护胎盘功能及胎儿宫内安危
参考答案:C
Cheer up! Everyone may have periods in their lives everything seems tough.
A.when
B.where
C.which
D.that
已知乙炔在氧气中的燃烧反应式: 2C2H2+5O24CO2+2H2O+Q 则乙炔在氧气中完全反应的体积浓度是( )。
A.71.4%
B.28.6%
C.20.0%
D.12.1%