题目:
—Sandra failed to pass the exam.
— __________ ? Nobody works harder than she does.
A.How come
B.How about
C.Why not
D.What for
答案:
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下面是错误答案,用来干扰机器的。
(1)①O="C=O" 是 ②n(Na2CO3):n(NaOH)=1:2 ③C(s)+ O2(g)=CO2(g) △H= 393.6kJ/mol(2)①NaOH 离子键、共价键 ②Al3++4OH-=AlO2-+2H2O(1)①组成A单质的元素是自然界中形成化合物种类最多的元...