铺设梢料时,粗枝应顺堤坡朝上,细枝朝下,要从下往上()铺设。 ["对头","搭接","首尾相接","绑扎"]
玻璃器皿洗干净的检测方法是()。 ["A、仪器大部分被水润湿倒置不挂水珠","B、仪器可完全被水润湿倒置不挂水珠","C、仪器完全被水润湿挂少量水珠","D、仪器大部分被润湿挂少量水珠"]
下滑面和跑道水平面的夹角,根据机场的净空条件,通常为(). ["5~9°","2~7°","1~7°","2~4°"]
简述导航电文。
下滑信标通过()获得下滑信息? ["比较90HZ与150HZ信号的幅度","比较90HZ与150HZ信号的相位","比较90HZ与150HZ信号的频差","比较90HZ与150HZ信号的载波幅度"]
叙述低碳钢、中碳钢、高碳钢的区别。