该孔洞的尺寸大小为：能让人手穿过它，去卸下或装上火花塞帽。
The size of the hole enables people to penetrate hand through to dismantle or assemble a spark plug cap.
将火花塞帽的内六角孔与火花塞的外六角对齐后稍微用力按压并顺时针旋转一点角度即可扣住火花塞。
The hexagon of spark plug and plug cap need align and then push down the spark plug cap and clockwise rotation it.
主要干扰源是火花塞、压点火线帽和高压点火线。
The main interference source is spark plug, high-voltage ignition coil cap and the high-voltage coil.
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