对煤气中毒人员搬运过程中,搬运原则是什么?
参考答案:
1.使用最有力的身体部分,如:腿、肩。
2.尽量将重量贴近自己的身体。
3.要注意保护自己,防止防毒仪器脱落。
Jenny is on holiday now. I wonder _______. [ ]
A. when she will come back
B. when she came back
C. when will she come back
D. when did she come back
长城西段遭受严重破坏的自然原因是()
A.流水侵蚀
B.风化和风蚀
C.冰川侵蚀
D.水的溶蚀