A:CN-可以和稀硫酸反应生成HCN
B:CN-可被Cl2氧化成(CN)2
C:在水溶液中(CN)2可被F-还原
D:HCN的电子式为
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已知等差数列{an}中,a2=7,a4=15,则前10项的和S10=( )
环境中影响生物生活的各种因素叫做____.它分为____和____.