FeCl3水溶液呈酸性
稀释,酸性减弱,碱性增强
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- 2what time do you get up every day?I get up at a（q） past six every day.
- 3在直角三角形ABC中向量AB=（-2,3）向量AC=（1,k),求k的值
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- 5Your best friend is more popular than you.用英语写个建议
- 6英语A _ _ people like pop music
- 7would you like some tea or coffee?
- 8By this time next year,they ______ for sixty years.
- 9设以P（2,2）为圆心的圆与椭圆x2+2y2=1交于A、B两点,求线段AB中点M的轨迹方程.
- 10在△ABC中，AB=AC=5，cosB＝3/5（如图）．如果圆O的半径为10，且经过点B，C，那么线段AO的长等于_．