99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

單項選擇題

If a hydraulic governor has been refilled with oil, the engine should be operated until it reaches normal temperaturethen the air should be purged, and the()

A.rack position should be adjusted
B.compensating needle valve should be opened fully compensating
C.needle valve should be adjusted to stabilize operation
D.speed limiting device should be adjusted

微信掃碼免費搜題