问题描述：
[单选]
The water in an operating auxiliary boiler should be tested for alkalinity and chloride content each（）．
A．hour
B．day
C．week
D．month
参考答案：查看无
答案解析：无
☆收藏
答案解析：无
☆收藏
上一篇：An indication of a diesel engine air intake being partially clogged， is（）．
下一篇：On a turbo-charged， medium-speed diesel engine， which of the following problems is an indication of a restricted air intake passage？
- 我要回答: 网友(216.73.216.168)
- 热门题目: 1.超级汽轮发电系统（STG）是 2.现代柴油机的余热情况有较大变 3.用于供热系统的废气锅炉，其蒸