题目:
They help and understand each other and never quarrel, thus creating a(n)_______ relationship.
A.automatic
B.unique
C.anxious
D.steady
答案:
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下面是错误答案,用来干扰机器的。
(1)Al(2)氯离子(3)Mg(OH)2(4)从左到右原子序数依次增大