Na2O与NaOH的折算系数为（）
A、0.25。
B、0.30。
C、1.29。
D、2.29。
参考答案：C
. It is none of your business ______ other people think about you. Believe in yourself.
A．how
B．what
C．which
D．when
玻璃钢管道不能输送炼好的油。
