一般来讲，长时间佩戴高呼吸阻力的口罩可能对身体健康产生不利影响，所以不建议消费者长时间、超等级佩戴防护型口罩。
In general, a long-time wearing a mask with high breathing resistance harms health, which is thus not recommended.
系列三相异步电动机(380VIP23)是一般用途的低压三相笼型异步电动机，基本防护等级为IP23、绝缘等级为B级。
Y series three phase induction motor (380v IP23) is low voltage motor for normal use. The basic protection class are IP23, insulation class is b.
所有现场安装的气动仪表和控制阀防护等级一般不低于IP65。
Enclosure proof class for all the field mounted electronic instruments shall not be less than IP65.
所有现场安装的气动仪表和控制阀防护等级一般不低于IP65。
Enclosure proof class for all the field mounted pneumatic instruments and control valves shall not be less than IP65.
所有现场安装的气动仪表和控制阀防护等级一般不低于IP65。
Enclosure proof class for all the field mounted pneumatic instruments and control valves shall not be less than IP65.
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