某种花生出油率为25%，要想榨出100千克花生油．需要多少千克花生？
100÷25%=400（千克）；
答：需要多400千克花生．
支架支护的采煤工作面回风流是指距棚梁和棚腿为（）的采煤工作面回风巷空间的风流。
Pierre Curie stopped his research and _______ Marie in the search of an unknown material.
A．attended
B．joined
C．took part in
D．joined in
