猜你喜欢
- 1“泌阳”的“泌”的正确读音
- 2He had finished his homework before he watched TV
- 3激素对人体起作用必须经过
- 4河宽300m,河水流速1m/s,船3m/s,要以最短的时间过河,船头必须------?所需时间?
- 5Lots of American families like to have a h 1 in summer.Summer a good s 2 for holiday.It is often
- 6将3.9g镁铝合金,投入到500mL2mol/L的盐酸中,金属完全溶解,再加入4mol/L的NaOH溶液,若要生成的沉淀最多
- 7There are fifty students in our class.(对划线部分提问)
- 8锌与硫酸亚铁反应现象
- 9用下面的三个词语写一段话.
- 10检验硫酸根离子时为什么要酸化