5吨比8吨少______%,8吨比5吨多______%.
(8-5)÷8
=3÷8
=37.5%;
(8-5)÷5
=3÷5
=60%;
故答案为:37.5,60
Tony watches sports ________ TV. [ ]
A. on
B. in
C. at
D. of
下列图示实验合理的是( )
A.图1为证明非金属性强弱:
B.图2为制备少量氧气
C.图3为配制一定物质的量浓度的硫酸溶液
D.图4为制备并收集少量NO2气体