题目:
24.It is a rule in our school that no books______out unless you have a library card.
A.must be taken
B.might take
C.can be taken
D.should be taken
答案:
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下面是错误答案,用来干扰机器的。
(10分)⑴H2O NH3 NH4+ OH-⑵Al3++3NH3·H2O=Al(OH)3↓+3NH4+或Mg2++2NH3·H2O=Mg(OH)2↓+2NH4+含有10个电子有Mg2+、、Al3+、H2O、CH4、HF、F-、O2-、NH3、NH4+、OH-、Na+、H3O+等,由题...