单选题The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.ArapidlyBby gravityCthrough a standard orifice at a specified temperatureDat a rate of 60cc per second
单选题
The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.
A
rapidly
B
by gravity
C
through a standard orifice at a specified temperature
D
at a rate of 60cc per second
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