Every good story is carefully ______ ; the elements of the story reduced to fit with one another in order to make an effect on the reader.

A．emphasized
B．selected
C．planned
D．examined

不锈钢管的坡口加工可以用电动坡口机、气动坡口机、车床和（）等进行。

A.气床

B.锯床

C.等离子切割坡坡口机

D.手工打磨