测定原油密度，密度计底部与量筒底部距离要大于（）mm。
A、20
B、25
C、30
D、35
参考答案：B
You used to be really little fat, _______ you? [ ]
A. did
B. Didn't
C. didn't
D. Did
急性肾衰竭患者每日所需热量是（）
A.20kcal/kg
B.25kcal/kg
C.30kcal/kg
D.35kcal/kg
E.40kcal／kg
