A dirty fuel oil filter is can be detected by ()<br /> Ⅰ.fuel oil analysis<br /> Ⅱ.observing the pressure drop across the filter<p> A dirty fuel oil filter is can be detected by ()<br /> Ⅰ.fuel oil analysis<br /> Ⅱ.observing the pressure drop across the filter</p>
A、A.Ⅰonly
B、B.Ⅱonly
C、C.eitherⅠorⅡ
D、D.neitherⅠnor