灯具(金属外壳壁灯、安全标志灯、疏散标志灯)距地面高度低于2.4m时,安装有何要求?
参考答案:
灯具的可接近裸露导体必须接地(PE)可靠,并有专用接地螺栓,且有标识。
In this passage, inertia means ______
A.a situation in which no action is taken
B.a situation in which no progress is made
C.the feeling of someone not wanting to move or do anything
D.the force making an object stay at rest or continue moving
下列疾病中血清铁蛋白可升高的有()
A.血色病
B.慢性病贫血
C.成人斯蒂尔病
D.肾性贫血
E.缺铁性贫血