电梯制造单位未依法对电梯进行校验、调试的，由特种设备安全监督管理部门责令限期改正；逾期未改正的，予以（） ["通报批评","责令停业","吊销营业执照","处以5万元罚款"]
怎样进行池塘养殖水体的净化？
我国北方在温度较低时露天培育甘蓝小苗，但不会使之通过春化，这是因为（） ["温度不够低","没有充足的营养","光照不足","苗太小，不能发生春化"]
晶闸管调速系统中，按所取不同的反馈量分有（）。 ["单闭环","多闭环","转速负反馈","电压负反馈","电流负反馈","电流正反馈"]
In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate. ["the fuel oil","the lubricating oil","the refrigerating oil","the hydraulic oil"]
烟草种植应当遵循什么原则？
