()与燃烧室容积的比值称为压缩比。 ["汽缸工作容积","汽缸总容积","汽缸工作总容积","汽缸容积"]
食用合成色素有哪些毒性?
拔桩时,必须注意起重机额定起重量的选择,通常用估算法,即起重机的回转半径应以桩长1m对()t的比率来确定。 ["0.5","2","1","1.5"]
柴油机的()是自动调节喷油泵供油量的装置。 ["喷油泵","调速器","输油泵","高压泵"]
K型树脂锚固剂搅拌时间是() ["A.10-15秒","B.15-20秒","C.20-25秒","D.25-30秒"]
常用抗氧化剂有哪些?