A:2 mol
B:1 mol
C:0.5 mol
D:0.25 mol
A
冰刀片——抗腐蚀合金钢
B
速滑服——芳纶纤维
C
防切割手套内层材质——聚乙烯纤维
D
防护镜——聚甲基丙烯酸甲酯
戊戌变法的诸项措施中,有利于资本主义发展的( )
The students all well ____ (prepare) for the coming exams, so they all believe that they can easily pass them.