Sam has got a bike. He goes to school by bike. Amy hasn't got a bike. Her father has got a car. She goes to school in her father's car. Daming hasn't got a bike. He goes to school by bus.
将胆矾与生石灰、水按质量比为1：0.56：100混合配成无机铜杀菌剂波尔多液，其成分的化学式可表示为CuSO4•xCaSO4•xCu（OH）2•yCa（OH）2，当x=3时，y为（ ）
汽车不用汽油也能行驶．（ ）
水分从土壤进入根毛的途径（ ）
如图所示的工具中，正常使用时属于费力杠杆的是（ ）
