问题描述：
[单选]
The piston ring grooves for a standard engine are（）
A．chromium-plate against wear
B．anti-corrosion treated
C．white metal lined against wear
D．flame hardened against wear
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：The piston rings are manufactured with a diameter（）the bore of the cylinder．
下一篇：The piston moving up and down keeps the crankshaft（）．
- 我要回答: 网友(18.217.251.235)
- 热门题目: 1.采用压铅法测量主轴承的轴承间 2.压铅法测量轴承间隙应采用（） 3.换新十字头轴瓦时，十字头销与