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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。

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正确答案：A （备注：此答案有误）

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