对前置胎盘的孕妇进行腹部检查,哪项是正确的
A.胎位不易摸清
B.宫体硬如板状
C.子宫大于妊娠月份
D.不易发生胎位异常
E.枕先露者胎头高浮
参考答案:E
下列商品进出口须事先申领精神药品进出口准许证的是:
A.可卡因 B.大麻 C.合成麻醉药 D.咖啡因
A portable dry chemical fire extinguisher discharges by().
A.gravity when the extinguisher is turned upside down
B.pressure from a small CO2 cartridge on the extinguisher
C.air pressure from the hand pump attached to the extinguisher
D.pressure from the reaction when water is mixed with the chemical