Write your educational background in the order of time.
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After writing your personal information, you should write your educational background.
A. 对
B. 错
721型分光光度计使用之前仪器应预热( )min。
A. 0
B. 5
C. 10
D. 20
用20 mL移液管移出溶液的准确体积应记录为( )。
A. 20mL
B. 20.00 mL
C. 20.0 mL
D.20.000 mL