起重机臂架轴线挠度不应超过其长度的:() ["1/1000","1/1500","1/2000","1/500"]
北方包饺子时会放什么东西进去,寓意先吃着了,就能多挣钱?
每年从农历腊月二十三日起到年三十,民间把这段时间叫做“()”
装卸货期间,吊杆的调整布置应由:() ["装卸工人负责","值班水手负责","值班驾驶员负责","水手长负责"]
操纵千斤索升降机使吊杆升起时,不必同时有控制地松出:() ["中稳索","吊货索","调整稳索","保险稳索"]
守岁,就是在旧年的最后一天夜里不睡觉,熬夜迎接新一年的到来的习俗,也叫除夕守岁,俗名“()”