钢脚手工具宜选用（）规格。
A.Φ48×3
B.Φ57×3.5
C.Φ76×4
参考答案：A
物体从固态变为液态的现象称为（）。
A.熔化
B.溶解
C.融化
D.溶化
E.液化
If your friend comes here with any more criticism about how we bring the children up, I'll tell him to ________ his own business.
A．take pleasure in
B．go about
C．be trapped in
D．cater to
