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单选题
Unless all of the solid contaminants are removed from the air before it enters the instruments, they will accumulate, usually in the rotor bearings, and slow the rotor.
A
除非所有固态杂质在进入设备前从空气中过滤，否则它们会卡阻，经常在转子承受范围内减缓转子的转动。
B
除非所有固态污染物在进入仪表前从空气中去除，否则它们会积累,通常在转子轴承中，并减慢转子的速度。
C
如果空气中所有的固态污染物不在吸入仪表前去除，它们通常会在旋翼轴上聚集，并减慢旋翼速度。
答案解析
正确答案：B
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