最大粒径25㎜碎石或卵石的含泥量试验所需试样的最少数量为（）kg。
A.20
B.40
C.24
D.25
参考答案：C
–There will be a talk show this time tomorrow. Would you go with me ?
--I’m sorry,but I _____an important meeting.
A．have attended
B．will be attending
C．am about to attend
D．would attend
淡水鱼苗培育为什么要用多种饲料进行培育？池塘培育种苗有什么优点？
