改善镗削加工的工艺系统刚度，首先应提高（）的刚度。 ["刀具","量具","模具","夹具","辅助工具","吊具"]
严禁将施焊把线绕在（）或搭在背上。 ["身上","工件上","脚手架上","建筑物上"]
《统一国际航空运输某些规则的公约》亦称（） ["《国际民用航空公约》","《芝加哥公约》","《华沙公约》","《制止非法劫持航空器的公约》"]
在镗床上采用镗杆进给镗孔时，由于镗杆悬伸过长，会使镗出的孔呈（）。 ["椭圆形","锥形","喇叭形","孔口大","孔径大","腰鼓形"]
关于投标保证有效期的说法，正确的是（） ["A.投标保证有效期应从投标时起算 ","B.投标保证有效期应从开标日期起算 ","C.投标保证有效期不得延长 ","D.投标保证有效期应长于投标有效期"]
易装症
