问题
单项选择题
铁路列车高速运行下，轮对的轴温会因摩擦升温，造成燃轴、切轴事故的发生。为保证铁路行车的安全，在铁路干线上，应设红外线轴温探测网，轴温探测站的间距一般按( )km设置。
A．10
B．20
C．30
D．40
答案
参考答案：C
解析：在干线上，应设红外线轴温探测网，轴温探测站的间距一般按30km设置。
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铁路列车高速运行下，轮对的轴温会因摩擦升温，造成燃轴、切轴事故的发生。为保证铁路行车的安全，在铁路干线上，应设红外线轴温探测网，轴温探测站的间距一般按( )km设置。
A．10
B．20
C．30
D．40
参考答案：C
解析：在干线上，应设红外线轴温探测网，轴温探测站的间距一般按30km设置。
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| A fox is 1 food. He is very hungry. Now he 2 near a wall. The wall is very 3 . The fox is looking up. He sees 4 fine grapes 5 the wall. He smiles says," 6 nice they are! I want to eat them." The fox is jumping. He jumps and jumps, 7 the wall is too high. He 8 get the grapes. The fox says," I must go now, I don't like those grapes. 9 are green. They are not 10 to eat." | ||||
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