赞题库-背景图

多项选择题

矿井防灭火方面的要求包括()。

A.井下消防系统应每隔150m设置支管和阀门
B.在带式输送机巷道中应每隔100m设置支管和阀门
C.井上、下必须设置消防材料库
D.井下严禁使用灯泡和电炉取暖
E.在开采容易自燃和自燃煤层时，在采区要有符合《煤矿安全规程》要求的防火设计

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热门试题

单项选择题For the influences of solar activities on climate change, which of the following options is wrong?

A．The change of sunspot numbers may represent the change of solar activity intensity;
B．Since the Industrialized Revolution, solar activities have played a weak role to climate change;
C．In the past over twenty years, the intensity of solar activity has increased significantly;
D．The impact mechanism of solar activity on the global climate has not been confirmed.

单项选择题左心室比右心室壁厚，这是因为左心室A、射血速度较快B、每搏输出量较大C、射出的血液所流经的管道较狭窄D、心指数大于右心室E、比右心室做更大的搏出功