You should tell _____ about it if _____ doesn't know it.
A:her; herself
B:she; she
C:her; she
下列说法正确的是( )
①2Ca2+﹣﹣2个钙离子 ②O2﹣﹣2个氧原子 ③2H2O﹣﹣2个水分子
④2H﹣﹣2个氢元素 ⑤ N20 ﹣﹣氮气中氮元素的化合价为零.