Which statement best describes George Daniels' interest in watches?
A.His interest in watches was strong because his father was a watchmaker.
B.His interest in watches grew because he had to repair watches when he was in the army.
C.His interest in watches started at school.
D.His interest in watches is lifelong.
第2题
下列属于阴离子型表面活性剂的是
A.吐温80
B.司盘80
C.卵磷脂
D.硬脂酸钙
E.苯扎溴铵
第3题
下列属于阴离子表面活性剂的是
A.司盘60
B.吐温80
C.卵磷脂
D.十二烷基硫酸钠
E.苯扎溴铵
第4题
下列属于阴离子型表面活性剂的是 ()
A.司盘80
B.卵磷脂
C.吐温80
D.十二烷基磺酸钠
E.苯扎溴铵
第7题
属阴离子型表面活性剂的是
A、吐温-60
B、苯扎氯铵
C、十二烷基硫酸钠
D、司盘-60
E、卵磷脂
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