吊运套管时的可能因为气动绞车造成砸伤人员和砸坏设备事故的原因有（）。
A、钢丝绳断裂
B、琵琶头脱开
C、刹车失灵
D、以上都对
参考答案：D
1岁小儿HbF所占的比例为（）
A.10%
B.30%
C.70%
D.小于2%
E.小于5%
The Lantern Festival, also known as Yuanxiao Festival or Shanguuan Festival, __________ the 15th day of the 1st lunar month in China
A falls for B falls out C falls on D falls off
