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【单选题】
Why did the King of Brobdingnan refuse to lean how to make gunpowder?A.
Because he thought it was too difficult to make gunpowder.
B.
Because he was once hurt by gunpowder.
C.
Because he didn't believe in Gulliver.
D.
Because he didn't want to know how to murder people using powder.
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【单选题】The cubic unit cell of a perovskite structure containing atoms of types A, B, and C is illustrated below. What is the empirical formula of this substance?
A.
ABC
B.
ABC3
C.
AB4C6
D.
AB8C12
【单选题】What is the empirical formula of a compound that is 64.8% C, 13.6% H, and 21.6% O by mass?
A.
C 4 HO 1
B.
C 5 HO 2
C.
C 8 H 20 O 2
D.
C 5 H 14 O 1
E.
C 4 H 10 O 1
【单选题】Predict the empirical formula of the ionic compound that forms from sodium and fluorine.
A.
NaF
B.
Na 2 F
C.
NaF 2
D.
Na 2 F 3
E.
Na 3 F 2
【简答题】分组教学是为了克服班级授课制的弊端而提出的，因此比班级授课制优越。 （ ）
【简答题】分组教学是为了克服班级授课制的弊端而提出的，因此比班级授课制优越。
【简答题】分组教学是为了克服班级授课制的弊端而提出的，r因此比班级授课制优越。（ ）
【简答题】分组教学是为了克服班级授课制的弊端而提出来的，因此它比班级授课制优越。判断
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