问题描述：
[单选]
The trouble-free life of an engine indicates（）．
A．the period of time during which no trouble occurs to the engine
B．no trouble will occur to the engine all its life
C．trouble may occur freely to the engine
D．no matter what you do to the engine, no trouble will occur during this period
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：When we say that two objects have relative motion， we mean（）．
下一篇：General， the best way for replacement of lamp is（）．
- 我要回答: 网友(216.73.216.168)
- 热门题目: 1.柴油机气缸套与活塞环工作表面 2.当气缸内径增量超标时，应选用 3.当柴油机气缸套产生较大拉痕、