according to the invention is easy to maintain. in the throttle body, throttle body and the throttle valve in the interior of the hinge has a hinge fixed to the width direction is formed on the ridge, the throttle valve is rotating, the rotation on the chin began to receive in closing, the throttle valve and the throttle body in accordance with the relevant information to the full to maintain, can be realized, the cylinder's intake from the exhaust steam device can be put into use can prevent the aircraft to maintain a family. on the frame body.
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