皮皮学，免费搜题
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【简答题】
（1）在生活中我们知道这样的事实：①食盐易溶于水，而难溶于植物油；②硝酸钾易溶于水，而碳酸钙难溶于水； ③蔗糖在热水中溶解的质量比在等质量的冷水中溶解的质量多． 上述事实①②③分别说明，固体物质的溶解度主要与______、______、______三个因素有关． （2）将一块塑料板放入50℃的硝酸钾饱和溶液中，塑料板漂浮于液面上（如图1）．若将溶液降温到20℃时，可观察到的现象是______；______．若要看到塑料板上浮，应采用的方法是______． （3）常温下，有几小粒硝酸钾晶体的试管中，加入饱和硝酸钾溶液，并固定在的烧杯中（如图2所示）． 同烧杯中加入某种物质后并搅拌，结果试管中的晶体消失了．请你猜测，同学加入的物质可能是______、______．
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反馈参考答案：
举一反三
【单选题】L isten to the transmission or short exchange and choose the correct answer .
A.
Join right hand downwind at 3000ft
B.
Join right hand downwind at 2500ft
C.
Join left hand downwind at 3000ft
D.
Join left hand downwind at 2500ft
【单选题】L isten to the transmission or short exchange and choose the correct answer .
A.
For spacing
B.
For separation
C.
Due sequence
D.
Due traffic
【单选题】L isten to the transmission or short exchange and choose the correct answer .
A.
Backtrack and vacate runway 04
B.
Turn left onto taxiway A4 proceed to C3
C.
Via A3 and C4.
D.
Via A3 and C3.
【单选题】L isten to the transmission or short exchange and choose the correct answer .
A.
Backtrack and vacate runway 04
B.
Backtrack runway vacate via exit 4
C.
Vacate via taxiway B3 and D2
D.
Vacate via taxiway B2 and D3
【简答题】L isten to the recording and choose the correct letter, A , B , or C .
【单选题】L isten to the transmission or short exchange and choose the correct answer .
A.
Make long approach
B.
Follow Airbus on 45km final
C.
Land before the Airbus on final
D.
Make short approach
【单选题】L isten to the transmission or short exchange and choose the correct answer .
A.
Take the first right
B.
Take the first left
C.
Via taxiway C
D.
Via taxiway D
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