压气机攻角是指:(). ["整流叶片中弧线前缘点切线和气流进气速度的夹角","叶轮叶片中弧线前缘点切线和气流进气速度的夹角","整流叶片中弧线前缘点切线和气流进气相对速度的夹角","叶轮叶片中弧线前缘点切线和气流进气相对速度的夹角"]
在LTE中,一个ZC序列与同一序列的任何循环移位(CS)之间的相关性为() ["-1,","0,","1,","2."]
登船梯采用()实现减速驱动驱绳轮。 ["A、液力变矩器","B、齿轮减速机构","C、摆线针轮减速器","D、带传动机构"]
()不属于生物杀虫剂 ["A、苏云金杆菌","B、绿僵菌","C、球形芽胞杆菌"]
悬臂吊能否在旋转的过程中实现起升动作。() ["A、不能","B、能","C、不确定","D、视条件而定"]
电子银行的特点是什么?