He is retired now. He used to work for a publishing company. He travels down to London maybe two or three times a month.
查看答案
He's an expedition leader. He spends about 1/3 of his time outside the United Kingdom.
A. 对
B. 错
卸装油与清洁霜在配方组成上最大区别是( )
A. 溶剂
B. 表面活性剂
C. 洗涤助剂
D. 防腐剂
下列哪项不属于洁肤化妆品的作用机理
A. 表面活性剂洁肤
B. 相似相溶机理
C. 摩擦洁肤
D. 酸碱中和
油相制备时,加热温度应该为( )
A. 油脂中最高熔点
B. 油脂中最高熔点高10-15℃
C. 油脂的平均熔点
D. 油脂的最低熔点
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