What's the hardness of an oxygen?

Technician a says that the sine with dwell (swd) test is used to determine if an electronic stability control system functions normally. technician b says that the esc lamp, called a telltale light, is required to remain on for two minutes. who is correct?

Is revlon performing better or worse than it was the previous day? how do you know?

What pact signed on 1949 reinforce that the united states would not return to an isolationist policy