问题描述：
[单选]
To avoid scavenge fires（）the engine timing and equipment maintenance should be correctly carried out．
A．occurred
B．occurring
C．not happening
D．occur
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：To avoid scavenge fires occurring the engine timing and equipment maintenance（）．
下一篇：Those generally used additives for cooling water are either anti-corrosion oils or inorganic（）．
- 我要回答: 网友(216.73.216.29)
- 热门题目: 1.废气锅炉烟道温度在300—4 2.废气锅炉小的烟垢着火，对锅炉 3.在有充分氧气存在时，烟垢的可