尿胆原是()。
A.结合胆红素排入尿中
B.重吸收的胆素原排入尿中
C.结合胆红素在尿中被氧化而成
D.未结合胆红素排入尿中
E.正常人尿中无
参考答案:B
I have been told that our teacher has _____the deadline for the composition ______ two days and we have to hand it in tomorrow morning.
A.made; by
B.cut; to
C.advanced; by
D.suggested; for
LD50的含义是()。
A.半数致死量
B.半数死亡时间
C.半数凋亡量
D.半数细胞活力
E.半数病毒量