What is the meaning of upper control limit and lower control limit in control charts

A:Specification limits. B:Acceptable range of the variance of a process. C:Acceptable range of the variance of a product. D:Customer requirements.

The "explosive conflict" in the first paragraph refers to

A:salmon's return to British Columbia's rivers to spawn. B:the fisheries committee of Canada's House of Commons and Bryan Williams. C:the struggle between sockeye salmon and human beings. D:the collision between salmon's survival and human fishery.

WHICH ARE LIMIT ARTICLES?( )

A:HAIR MOUSSE B:HAIR SPRAY C:LIQUID ARTICLE D:KNIFE

The explosive range of a mixture of flammable vapors is specified as a percentage of _____.

A:flammable vapor by volume in air B:oxygen present to support combustion C:the temperature of the flash point D:the lower limit of explosibility of the mixture

The flash point of a petroleum product is an indication of its .

A:viscosity B:pour point C:volatility D:lower explosive limit

One engine manufacturer recommends heavy fuel oil should not be heated above 80 ℃ to 95℃ (176 ℉ TO 203℉) before purificationThis upper limit should be observed to ensure against_________.

A:flattening of the bowl neoprene O-rings B:operation within the explosive rang of the fuel C:excessive purifier operating pressures D:excessive oil viscosity

The lowest temperature at which the vapor formed from a liquid ignites and continues to burn steadily in the presence of an ignition source is called the _____.

A:flash point B:fire point C:upper explosive limit D:lower explosive limit

Limit switches are used on ______．

A:sheath-screw davits B:gravity davits C:radial davits D:quadrantal davits"

A fuel-air mixture below the lower explosive limit is too ______．

A:rich to burn B:lean to burn C:cool to burn D:dense to burn"

What is the meaning of LEL?

A:Low evaporation limit B:Lower exposure limit C:Lower explosive limit D:Low explosion level"