阻风门属于化油器中的()。 ["A、起动装置","B、怠速装置","C、加速装置","D、加浓装置"]
用两种物质标定NaOH溶液的浓度(单位为mol∙L-1)得如下结果: A、0.09785,0.09790,0.09710,0.09895 B、0.09710,0.09795,0.09785,0.09700,0.09705 试问这两组数据之间是否存在显著性差异(P=95%)?
控制冷却水大、小循环方式的部件是()。 ["A、水泵","B、温度表","C、节温器","D、水套"]
叉车转弯时,时速不能超过()千米/小时。 ["A、3","B、5","C、8","D、10"]
脉流牵引电动机大都采用()固定结构。
脉流牵引电机补偿绕组一般用扁铜线按同心式扁绕或()绕数匝而成。