脂肪酸山梨坦类非离子表面活性剂
A．卵磷脂B．吐温80C．司盘80D．卖泽E．十二烷基硫酸钠
参考答案：C
The young man was glad that his experience as a cook in the army finally ____.[ ]
A. paid off
B. paid for
C. paid up
D. paid back
建立建筑机械操作人员（）
A.管理制度
B.建筑机械操作规程
C.维护保养制度
D.奖罚措施
E.进退场要求
