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

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

出自：海船船员证

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