对接管口时,应检查管道平直度,在距接口中心200mm处测量,允许偏差为lmm,在所对接钢管的全长范围内,最大偏差值不应超过()mm;
A.5
B.10
C.15
D.20
参考答案:B
The man we met this morning grows many kinds of plants in his garden, most of which are flowers including succulents and cacti.
A.rises
B.raises
C.plants
D.plows
事故调查中“四不放过”的原则是什么?