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单选题
2648. 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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