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【多选题】
由于弱酸弱碱的相互滴定不会出现突跃,也就不能用指示剂确定终点,因此在酸碱滴定法中,配制标准溶液必须用( )。A.
强碱
B.
弱碱或弱酸
C.
强碱弱酸盐
D.
强酸弱碱盐
E.
强酸
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举一反三
【单选题】You should have put the yogurt into the fridge, I expect it ______ undrinkable by now.
A.
became
B.
had become
C.
has become
D.
becomes
【单选题】You should have put the milk into the refrigerator, I expect it ______ bad by now.
A.
went
B.
had gone
C.
has gone
D.
goes
【单选题】You should have put the milk into the icebox, I expect it ______ undrinkable.
A.
became
B.
had become
C.
has become
D.
becomes
【简答题】You should have put the milk in the ice box I expect it ________ undrinkable by now. A) became B) had become C) has become D) becomes
【简答题】数据库设计三原则: 第一范式(1NF) 如:价格 联系方式(数组型) 第二范式(2NF) #姓名→用自增量ID实现实体区分 第三范式(3NF) 表与表通过公共字段(主键 外键)#外键外的字段(不出现)
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