制备薄荷水时滑石粉的作用是（）
A．分散剂
B．助悬剂
C．防腐剂
D．助溶剂
E．增溶剂
参考答案：A
Arriving in the deep night, we found there was no food _____ as all the shops were shut. [ ]
A. left
B. available
C. remaining
D. convenient
营业线上换梁的常用方法有哪几种？
