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单选题
648.打开控制活门[13]和[20],并操作手摇泵[17]以排空加注系统。 ( )
648.打开控制活门[13]和[20],并操作手摇泵[17]以排空加注系统。 ( )
A
Open the control valve [13] , close the control valve [20] and manually operate the oil pump[17] to empty the system.
B
Open the control valves [13] and[20] and operate the hand pump[17] to bleed the filling system.
C
Open the control valves [13] and[20] and manually operate the air inlet pump [17] for filling.
答案解析
正确答案：B
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