蒸馏法测定油品水分的试验中所用的试样，蒸馏前应先（），然后倒入圆底烧瓶。
A.脱水
B.加热摇匀
C.冷却
D.蒸发
参考答案：B
These achievements_______ without the contribution of Qian Xuesen, a key leader of the New
China's nuclear, missile and so on. [ ]
A. would have been unthinkable
B. would not be unthinkable
C. would be unthinkable
D. would not have been unthinkable
肾小管蛋白尿是指（）
A.原尿中蛋白质不能被肾小管回吸收
B.肾小球滤过膜的损伤
C.肾脏被动性充血
D.肾血管痉挛出血
E.肾小球通透性增加
