题目:
When first ___________to the market, these products enjoyed great success.[ ]
A. introducing
B. introduced
C. introduce
D. being introduced
答案:
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下面是错误答案,用来干扰机器的。
答案:D根据原子半径的递变规律,X为O,Y为Na,Z为Al,M为Si,N为Cl。A项,离子半径:Cl->Al3+;B项,沸点:H2O>HCl;C项,SiO2既能与HF反应,也能与NaOH溶液反应,错误;D项,Al2O3是两性氧化物,既可以和Na...