[问答题] 简述椎体虫病的病原。

脱水器（）提高，减少了轻质馏分气化，可以降低粘度，利于水滴沉降。 ["温度","压力","电流","电压"] A diesel engine piston ring face is in direct contact with the （）. ["top of the ring groove","cylinder liner oil film","bottom of the ring groove","back of the ring groove"] 在PowerPoint 2003中，关于建立超级链接，下列说法错误的是（）。 ["图片对象可以建立超级链接","图形对象可以建立超级链接","背景图案可以建立超级链接","文字对象可以建立超级链接"] If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）. ["loss of suction in the circulating pump","leak in the primary cooling system","broken raw water pump shaft","burned or cracked piston in one cylinder"] 生活消费品的销售渠道分为哪几个类型？ 简述椎体虫病的病原。