为了降低装置处理硫的负荷，采用催化碱洗后的汽油做原料。
查看答案
发文登记簿窗口中可按公文的哪些办理状态查询（）
A. 待办
B. 已办
C. 办结
D. 回收
Under normal operating conditions, the rudder is hydraulically locked unless （）.
A. the manual trick wheel is engaged for steering
B. the variable stroke pump is off stroke
C. a rudder order is given by the control system
D. an electric power system failure occurs at the steering gear
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