下列细度模数μ属于粗砂的是()。
A、3.7~3.1
B、3.0~2.3
C、2.2~1.6
D、1.5~0.7
参考答案:A
The witnesses ________by the police just now gave very different description of the fight.
A.questioned
B.being questioned
C.to be questioned
D.having questioned
布袋里有4种不同颜色的球,每种都有10个.最少取出多少个球,才能保证其中一定有4个球的颜色一样?