(____)Hi, Chen Jie! This is Mark.
(____)What's the weather like in Beijing?
(____)It's rainy. How about London?
(____)Hi, Mark!
(____)It's warm.
①尽可能废物利用;②尽可能使用标准件;③加工时要尽可能减少对复杂设备的依赖;④尽可能美观精致