A:more than the length twice
B:twice more than the length
C:more than twice the length
D:more twice than the length
Now we use a wash machine.
____改为____
探究绿叶在光下制造有机物的实验中:
①把盆栽的天竺葵放在黑暗处一昼夜.
下列有关物质浓度关系的描述中,正确的是( )