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Examine the flow control orifice and make sure the restrictor holes are free from blockage and contamination

A检查流量控制管路,避免节流孔发生堵塞或被污染。

B检查节流孔,避免流量控制管路发生堵塞和出现污染物。

C检查流量控制孔,确保节流孔无堵塞和污染。

正确答案:A (备注:此答案有误)

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