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【单选题】
含三萜皂苷水溶液,分别加入盐酸(酸管)和氢氧化钠(碱管)后振摇,结果是A.
碱管高
B.
酸管高
C.
两管泡沫高度相同
D.
两管泡沫产生后立即消失
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皮皮学刷刷变学霸
举一反三
【单选题】Which is the proper explanation of the word 'fade' ( Line 2, Para. 3 )?
A.
Disappear.
B.
Decrease.
C.
Demonstrate.
D.
Declare.
【简答题】A．statement B．situation C．environment D．explanation
【简答题】A．ysis B．appreciation C．understanding D．explanation
【单选题】Which is the proper explanation of the word 'fade'(L. 2, para. 3 )?
A.
Disappear.
B.
Decrease.
C.
Demonstrate.
D.
Declare.
【简答题】To my regret, your explanation is ______ (satisfaction).
【简答题】Give a brief explanation of Basel
【单选题】According to Paragraph 3, people are able to live longer and move comfortable, lives because______.
A.
they are able to make innovations
B.
they can build cities and record thoughts
C.
their population tends to increase
D.
they have special abilities to use ax