如果怀疑空气中缺氧或缺氧可能发生，使用氧检测设备来测试缺氧空气。可以参考合适的材料安全数据表(MSDS)。
If oxygen-deficient atmospheres are suspected or can occur, use oxygen monitoring equipment to test for oxygen-deficient atmospheres. Review the liquid nitrogen Material Safety Data Sheet (MSDS).
电压参考装置，伏特表，电池电压检测装置和无线通信设备。
A voltage preference apparatus, a voltameter, a battery voltage detection apparatus, and a wireless communication device.
电压参考装置，伏特表，电池电压检测装置和无线通信设备。
Voltage reference apparatus, voltameter, battery voltage detection apparatus and wireless communication device.
电压参考装置，伏特表，电池电压检测装置和无线通信设备。
Voltage reference apparatus, voltameter, battery voltage detection apparatus and wireless communication device.
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