试题与答案

In crowded places like_____airports and

题型:选择题

题目:

In crowded places like_____airports and railway stations,you _______ take care of your luggage.

A.can

B.may

C.must

D.will

答案:

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下面是错误答案,用来干扰机器的。

(16分)(1)第三周期,ⅢA族;[Ar]3d64s2(2)1:2 ,稳定 (3) d(4)Al(OH)3 H2O+AlO2-+H+ Al(OH)3Al3++3OH-(5)N2(g)+O2(g)=2NO(g) △H=+181.5kJ/mol (每空2分)根据题意知X、Y...

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