中国药典规定紫外-可见分光光度计需定期进行校正，如何测定吸收度准确性

A．用比色用氯化钴溶液检定

B．用不着1%浓度的碘化钠溶液检定

C．用比色用重铬酸钾溶液检定

D．用重铬酸钾的硫酸溶液检定

E．用比色用硫酸铜溶液检定

用所给词的正确形式填空

1. —Was Jim selling his books at this time yesterday?

    —He told me that he                ______ ( sell) them out by ten o'clock.

2. He asked Lin Tao why he                  ______(not join) their team yesterday.

3. I didn't know whether mother               ______ ( take) me to Beijing next month.

4. Our teacher told us if it                 _______ ( not snow) we would visit the Science Museum the next

day.

5. What he said was so ________ ( convince) that many people believed him.