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【判断题】
以甲基橙为指示剂,用 0.1mol×L -1 HCl 滴定 0.1mol×L -1 的 Na 2 B 4 O 7 溶液,以测定 Na 2 B 4 O 7 ×10H 2 O 试剂的纯度,结果表明该试剂的纯度为 110% 。已确定 HCl 浓度及操作均无问题,则引起此结果的原因是 Na 2 B 4 O 7 ×H 2 O 失水。A.
正确
B.
错误
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举一反三
【单选题】I think I was at school,____ I was staying with a friend during the vacation when I heard the news.
A.
or else
B.
or so
C.
and then
D.
even so
【单选题】----____? ---- It's very hot.
A.
What day is it today
B.
It's a fine day, isn't it
C.
Do you like the day
D.
How is the weather in Nanjing
【单选题】— _________ — It’s very hot.
A.
What bad weather ！
B.
It’s a fine day, isn’t it ？
C.
Do you like the day ？
D.
How is the weather in Nanjing ？
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