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【简答题】
（6分）硫酸或硝酸在下列用途或反应中各表现的性质是： A．强酸性 B．易挥发性 C．吸水性 D．脱水性 E．强氧化性 F．不稳定性 （1）胆矾中加入浓硫酸，久置变为白色粉末 ；（2）用铝槽车装运浓硫酸或浓硝酸 ； （3）蔗糖中加入浓硫酸，形成“黑色发糕” ___ ；（4）浓硝酸久置会变黄 ； （5）浓硝酸与不活泼单质反应 ；（6）98%以上的浓硝酸俗称“发烟硝酸” 。
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举一反三
【单选题】What month did she see the mark on the wall?
A.
Feburary
B.
December
C.
January
D.
March
【简答题】In The Mark on the Wall, the first thing the narrator thinks about the mark is a _______.
【简答题】In The Mark on the Wall, the mark on the wall finally proves to be a _________.
【单选题】Who is likely to be an antiquary, according to the narrator in The Mark on the Wall?
A.
an old nurse
B.
young scholars
C.
old wives
D.
a retired colonel
【单选题】"The Mark on the Wall” was written in the background of ____________.
A.
World War I
B.
World War II
C.
Hundred Years' War
D.
Seven Years’ War
【单选题】In The Mark on the Wall, the last thing the retired Colonel thinks about before dying is _________.
A.
his life as a whole
B.
the camp and arrowhead
C.
his family
D.
his heroic moments
【简答题】戴明环的四个过程是( )
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