A:put dow
B:pick out
C:leave behind
D:drop out
一元二次方程x2=2x的解为( )
a、b两物质的溶解度曲线如图,在t3℃时,把a、b两物质各5g分别加入到50g水中,则下列说法正确的是( )
- Do you have enough students to clean the classroom?
- No, I think we need ________ students.