A:2﹣甲基﹣2﹣丁烯
B:3﹣甲基﹣1﹣丁烯
C:2,3﹣二甲基﹣1﹣丁烯
D:2﹣甲基﹣1,3﹣丁二烯
Mother bought a lot of things _____ her daughter's birthday party.
解释下列词语
①憧憬
②清凉
填空(横线上填用途)
①水上救护机____
②水上战斗机____
③水上灭火机____
④水上运输机____
⑤水上捕鱼机____