A number of bricks were purchased to build a fireplace, at a cost of 40 cents each, but only of them were needed. If the unused 190 bricks were returned and their cost refunded, what was the cost of the bricks used to make the fireplace ？（）

A.$76

B.$228

C.$304

D.$414

E.$570

气门座粗铰后，应用光磨过的同一组气门进行涂色试配，查看印痕，看清接触面的宽度和所处的位置，如果接触带偏向气门工作面小头，可用（）进行修整。

A.60度和20度铰刀

B.60度和45度铰刀

C.用20度和45度铰刀进行修正