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【多选题】
下面关于离心风机原理叙述正确的是（    ）。
A.
离心通风机工作时，电动机带动叶轮旋转，使叶轮叶片间的气体在离心力的作用下由叶轮中心向四周运动，气体获得一定的压力能和动能。
B.
当气体流经蜗壳时，由于截面逐渐增大，流速减慢，部分动能转化为压力能，气体从出风口进入管道。
C.
在叶轮中心处，由于气体被甩出，形成一定的真空度(呈现负压)。
D.
吸入口空气被吸入风机(实质是被大气压力压入风机)。
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