标准溶液制备有直接配置法和标定法,下列哪种物质可直接配制()。
A.HCl
B.无水Na2CO3
C.NaOH
D.NaHCO3
参考答案:B
----Where did you meet him?
----It was in the hotel ______ he stayed ______ I met him.
A.where, that
B.that, where
C.where, where
D.that, that
下列数据中为合法的VFP常量的是()。
A、{02/07/2012}
B、.y.
C、True
D、15%