请教如下什么意思？

忧郁者

60.1.2 Mating attachment plugs with solid blades are to be inserted into the contact openings of three ofthe six devices. The devices are then to be placed into an environmental chamber and subjected to thefollowing conditions:
a) 4 hours at a temperature of 75 ±1°C (167 ±1.8°F) at a relative humidity of 92 ±3 percent.
b) 16 hours at a temperature of 75 ±1°C (167 ±1.8°F) at a relative humidity of 40 ±3 percent.
c) 4 hours at a temperature of 30 ±1°C (86 ±1.8°F) at a relative humidity of 60 ±3 percent.

上述为ul498中Dielectric Voltage-Withstand Test的语句。我想请问是测试时是a）b）c）都要做，还是任意满足其中的一个条件就可用。

yin168

应该是全部 a) b) c)

qing1234

所有均需要考虑

忧郁者

好的 谢谢 我手头上原来有本是别人写的企业标准，说是其中一项就可以。而我理解应该是都要，所以确认下。谢谢wongyatwah 和barryyan ！！！