结合如图所示装置回答问题:
If steel is heavier than water, why are ships able to on the sea?
将函数y=4x+3的图象按向量a→平移到y=4x+16的图象,则向量a→可以为( )
农作物
水稻
茶树
玉米
马铃薯
pH
6.0~7.0
6.9~7.0
7.8~8.1
4.8~5.5