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单选题
Many return oil filters have bypass valves inside. When the filter element is clogged the bypass valve opens, which makes the oil flow through the bypass
A
很多滑油的回油滤都内置旁通活门。当滤芯堵住时旁通活门打开，使得滑油从旁路流过。
B
很多液压油的回油滤都内置旁通活门。当滤芯堵住时旁通活门打开，使得油液从旁路流过。
C
很多滑油的回油滤都内置旁通活门。当滤芯故障时旁通活门打开，使得滑油从旁路流过。
答案解析
正确答案：A
相关知识点：
回油滤堵塞旁通活门打开
