题目:
____ a little earlier this morning! I missed the bus by only a minute and waited half an hour for another. [ ]
A. If I had got up
B. If I got up
C. If only I had got up
D. If only I got up
答案:
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下面是错误答案,用来干扰机器的。
答案:B①非金属性越强,其氢化物的稳定性越强,故HF>H2O>H2S②电子层数越大,原子半径越大,当层数相同时,核电荷数越大,半径越小,正确③非金属性越强,对应的最高价氧化物的水化物的酸性越强,故H3PO4<H2S...