单选题A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filterAⅠonlyBⅡonlyCeitherⅠorⅡDneitherⅠnor
单选题
A dirty fuel oil filter is can be detected by （） Ⅰ.fuel oil analysis Ⅱ.observing the pressure drop across the filter
A
Ⅰonly
B
Ⅱonly
C
eitherⅠorⅡ
D
neitherⅠnor
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