机械浆
参考答案：将植物纤维原料用机械方法制成的纸浆。
It's very nice _____ pictures for me. [ ]
A. of you to draw
B. for you to draw
C. for you drawing
D. of you drawing
消化道出血患者出现呕血提示胃内出血至少有（）
A.100～200ml
B.200～250ml
C.250～300ml
D.300～500ml
E.500～1000ml
