甲醇精馏时釜内残液甲醇含量指标值是多少？
参考答案：甲醇精馏时釜内残液中甲醇含量≤0.5%。
—We've spent too much money recently.
—Well, it isn't surprising. Our friends and relatives()around all the time.
A. are coming
B. had come
C. were coming
D. have been coming
空胶囊组成中，山梨醇的作用为（）。
A．成囊材料
B．增塑剂
C．遮光剂
D．防腐剂
E．增稠剂
