列哪些物料可用于包薄膜衣()
A.羟丙基甲基纤维素
B.羟丙基纤维素
C.乙基纤维素
D.甲基羟乙基纤维素
E.苯乙烯-乙烯吡啶共聚物
参考答案:A, B, C, D, E
It was the first time that I ______ the movie, and I fell in love with it at once.
A.am watching
B.was watching
C.have watched
D.had watched
加强军地团结协作的核心是()。