南美洲南部国家阿根廷已同意中国在其境内的内乌肯建立卫星跟踪站．读图，回答以下问题。
现有几个阻值为10Ω的电阻，电路中需要一个50Ω的电阻，至少应将____ 个10Ω的电阻____ 联．
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.
Now he goes to school ____ bus. （ ）
点M（3，﹣4）关于y轴的对称点的坐标是（ ）
