?????

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? (nicotine)?? (nicotiana alkaloids)12???????1928????t???^
???????c?40mg
????????????????247/745mmHg???? ???60?????????????????????
??????2%~3%???5% NaOH??????????2g????????????????????????
??
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??2g5% NaOH?20mL15mL????
1??25mL?2g?2mL 5% NaOH?10min??????1????????4mL...

n. [C]

1.,
2.(?)
The girl was startled when the balloon exploded.
????
3.(???)??
4.;?

? vi.

1.()[(+out/up)]
2.;
3.
Trade deficits have ballooned.
?

? vt.

1.?()
He balloons his cheeks when he is hesitant.
????
2.?

? a.

1.?;


?

??????? ?????????????????????B?v???????? ??????? ???????????? ??????????????????????????? ??????? ???????? ????? http://www.aishang.cn/question/6104 ??

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