双舌双头三保险门锁
双舌双头三保险门锁
相关考题:
QB/T2474-2000标准中方舌、钩舌的伸出长度应符合()A、双舌、钩舌≥12.5mm,双舌(钢门)9mm,单舌12mmB、双舌≥12.5mm,双舌9mm,单舌12mmC、双舌≥11mm,双舌(钢门)9mm,单舌12mmD、双舌≥12.5mm,双舌(钢门)9mm,单舌10mm
QB/T2474-2000标准中斜舌的伸出长度应符合()A、双舌≥11mm,双舌(钢门)9mm,单舌12mmB、双舌≥10mm,双舌8mm,单舌14mmC、双舌≥12mm,双舌(钢门)9mm,单舌12mmD、双舌≥11mm,双舌(钢门)9mm,单舌10mm
单选题三螺杆泵主、从动螺杆螺纹头数()。A都是单头B都是双头C前者单头、后者双头D与C相反