氢离子交换剂的再生过程,可用下列反应式表示:()=()()
参考答案:CaR2+2HCl=2HR+CaCl2;MgR2+2HCl=2HR+MgCl2;NaR+HCl=HR+NaCl
设2010a=3,2010b=6,2010c=12,则数列a,b,c( )
A.是等差数列但不是等比数列
B.是等比数列但不是等差数列
C.既是等比数列又是等差数列
D.既非等差数列又非等比数列
Mr Wang has two children. One is a boy and ______is a girl.[ ]
A. the other
B. another
C. other
D. others