寓言“刻舟求剑”中的主人公找不到掉入江中的剑,是因为他选择的参照物是( )
These fans arrived very early. They could see their favorite stars. (合并成一个句子)
These fans arrived very early ____ they could see their favorite stars.
代数式3a+4b可以表示不同的实际意义,试举实例说明:____
在Rt△ABC中,∠C=90°,BC=3 2 ,AB=2 6 ,则∠B的度数为____.