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【简答题】
称取混合碱2.400g，溶解稀释至250mL，取两份25.00mL溶液，一份以酚酞为指示剂，用0.1000mol/L HCl标准溶液滴定，耗去30.00mL；另一份以甲基橙为指示剂，耗去同浓度的HCl标准溶液35.00mL，问混合碱液的组成是什么?含量各是多少?
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举一反三
【单选题】What does the man suggest that the woman do?
A.
Go to another speech.
B.
Have lunch next door.
C.
Arrive for the seminar earlier.
D.
Wait until the speech is done.
【单选题】Why does the man have to go to work early this morning?
A.
He is working on a speech.
B.
He is leaving early to buy tickets for a ballgame.
C.
He is meeting with his boss.
D.
He is helping his cousin.
【简答题】某链条锅炉参数和热平衡试验测得的数据列于表3-8,试用正反热平衡方法求该锅炉的毛效率和各项热损失。
【单选题】What does the man want to do?
A.
Go travel．
B.
Go to the cinema．
C.
Have his hair cut．
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