C. Blow-back through the scavenge air ports, owing to an incorrectly adjusted exhaust cam disc or large resistance in the exhaust system(back pressure not exceed 300 mm wc)

由于排汽凸轮盘不正确的定时或排汽系统背压过大（背压不能超过300毫米水柱）而导致燃气通过扫气口倒流。

youdao

The var SEC sweep molding method, a universal 3-d design method for disc CAM is presented.

提出一种盘形凸轮三维通用设计方法—可变截面扫描成型法。

youdao

The company mainly produces and operating motorcycle accessories, CAM, rocker arm, starting disc, clutch and a series of products.

本公司主要生产及经营摩托车配件，凸轮，摇臂，起动盘，离合器等一系列产品。

youdao

This included entertainment by geisha, flights in police helicopters, sidetrips to Kyoto (250 km from Nagano) and shopping in Tokyo, where they and their friends were offered cam eras and compact-disc players.

CNN: TARNISHED RINGS