《刑事诉讼法》规定的结伙作案，是指2人以上（含2人）共同作案。
参考答案：对
I wonder _______ there are so many natural disasters across the world in 2010.
A．why is it
B．it is why that
C．why is it that
D．why it is that
W18Cr4V是钨系高速钢，属于（）高速钢。
A.特殊用途
B.新型
C.通用
