A:I﹣、Br﹣、Cl﹣
B:Br﹣、Cl﹣、I﹣
C:Cl﹣、I﹣、Br﹣
D:Br﹣、I﹣、Cl﹣
下列属于合成纤维的是( )
Vienna,the capital of Austria,is the River Danube and The Blue Danube is Strauss.
①有芒×有芒→有芒 ②有芒×有芒→有芒215+无芒70
③有芒×无芒→有芒 ④有芒×无芒→有芒101+无芒97.
有关长江的叙述,不正确的是( )