《煤矿矿井机电设备完好标准》规定:刮板输送机溜槽及连接件无开焊断裂,对角变形不大于()mm。
参考答案:6
Mary __________ the job he offered to her, but she didn’t.
A.can’t take
B.ought to have taken
C.should take
D.must have taken
《船上油污应急计划》用于帮助船员处理意外排油,其主要目的是制定必要的措施,以控制或减少排放和减轻其影响。