问题
单项选择题
变截面钢板弹簧一级保养工艺要求，钢板弹簧作业项目紧固工序检紧钢板吊耳支架固定螺栓作业步骤的技术标准是（）。
A、螺栓齐全、紧固不松动。扭紧力矩110－200N·m
B、螺栓齐全、紧固不松动。扭紧力矩210－300N·m
C、螺栓齐全、紧固不松动。扭紧力矩310－400N·m
D、螺栓齐全、紧固不松动。扭紧力矩410－500N·m
答案
参考答案：B
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变截面钢板弹簧一级保养工艺要求，钢板弹簧作业项目紧固工序检紧钢板吊耳支架固定螺栓作业步骤的技术标准是（）。
A、螺栓齐全、紧固不松动。扭紧力矩110－200N·m
B、螺栓齐全、紧固不松动。扭紧力矩210－300N·m
C、螺栓齐全、紧固不松动。扭紧力矩310－400N·m
D、螺栓齐全、紧固不松动。扭紧力矩410－500N·m
参考答案：B
Air is all round us．It is around us___31____we walk and play．From the time we are born，air is around us on every side．When we sit down，it is around us．When we go to bed．air is 32 around us．We live 33 air． All living things 34 air．Living things cannot live 35 air．We can live without any water for 36 days，but we cannot live for more 37 a few minutes without air．When we are working 38 running，we need more air．When we are asleep，we need less air We live in air but we cannot see it．We can only feel it．We can feel it when it is 39 ． Moving air 40 wind．
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