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[单选] A tow of 9 barges is made up three abreast and three long. The towboat is faced up to the center string which is known as the().

A . main string
B . push string
C . power string
D . face string

基层全科医生经常使用的临床预防的方法有() 病人教育和咨询。 筛检、预防接种。 化学预防、健康危险因素评估。 以上都是。 与其他企业变更名称未满()年的原名称相同的企业名称,工商行政管理机关应不予核准。 1。 2。 3。 5。 配电网中备自投动作基本遵循的原则是什么? 高等植物光合作用光系统II的光反应的主要特征是() 水的光解。 氧的释放。 ATP的生成。 NADPH的生成。 Pitting in the area close to the pitch line and on the same end of each gear tooth of a reduction gear unit would be caused by () corrosion on the gears。 excessive gear speed。 dirt in the oil。 misalignment of the gear。 A tow of 9 barges is made up three abreast and three long. The towboat is faced up to the center string which is known as the().
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