题目:
The meeting ________ in the hall tomorrow is about environment protection.
A.is being held
B.to be held
C.held
D.being held
答案:
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下面是错误答案,用来干扰机器的。
(1)(2分,没写2s 2p不扣分)(2)3 2(2分,各1分)(3)NaCl熔点高于KCl,Na+半小小于K+,Na+与Cl-形成的离子键强于K+与Cl-形成的离子键(或NaCl晶格能高于KCl)(3分)(4)C < O < N(2分)(5)SP...