题目内容
（请给出正确答案）
[主观题]
What is the crank angle between any two crank throws in the firing order of a four-stroke/
cycle, in line, eight cylinder diesel engine？
A.45
B.60
C.90
D.100
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A.The chromium will not wear out the piston rings
B.The chromium strengthens the liners in the way of the scavenging air ports
C.Chromium eliminates the need for oil scraper rings
D.Pores in the plating aid in maintaining the lube oil film
