有关妊娠急性脂肪肝下述哪项是正确的()
A.以经产妇居多
B.明显黄疸,但尿胆红素多为阴性
C.B超检查显示肝脏低回声
D.肝活检肝细胞广泛坏死
E.多妊娠早期发病
参考答案:B
关于东北平原成为商品粮基地主要原因的叙述,不正确的是[ ]
A.地势平坦
B.土壤肥沃
C.人口密度比较低
D.开发历史比较晚
The inside light in an inflatable liferaft is turned on().
A.automatically as the liferaft inflates
B.with a switch near the boarding handle
C.at night because the light has a photosensitive switch
D.by screwing the bulb in after the raft is inflated