可作为气雾剂表面活性剂的是
A.乙醇
B.七氟丙烷
C.聚山梨酯80
D.维生素C
E.液状石蜡
第1题
A.in which
B.which
C.where
D.when
第2题
A.in which
B.which
C.where
D.when
第3题
A.in which
B.which
C.where
D.when
第4题
A.which
B.where
C.whether
D.when
第5题
A.which
B.where
C.whether
D.when
第6题
it every day, as it always reminds me of my university days in London.
A) which B) where
C) whether D) when
第7题
it every day, as it always reminds me of my university days in London.
A) which B) where
C) whether D) when
第8题
A.which
B.when
C.whether
D.where
第9题
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