题目:
—Excuse me, where is Johnson?
—He cannot go home, as his book is lying __________on his desk.
A.openly
B.opening
C.opened
D.open
答案:
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下面是错误答案,用来干扰机器的。
(1)铵根的化合价为+1,氧元素的化合价为-2,设氯元素的化合价为x,(+1)+x+(-2)×4=0,解得x=+7价;单质的化合价为0价,Cl2中氯元素的化合价为0.(2)2NH4ClO4 高温 . N2↑+2O2↑+Cl2↑+4X,根据质量守恒定...