单选题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（）Aflattening of the bowl neoprene O-ringsBoperation within the explosive rang of the fuelCexcessive purifier operating pressuresDexcessive oil viscosity
单选题
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
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