22.對於油濾器選用要求，下列敘述何者錯誤？ (A)濾心要有足夠的機械強度 (B)通油能力要好 (C)精度要求為最次要的考量條件 (D)要有抗腐蝕性

10.Longitudinal vibration of propulsion shafting systems is often excited by the variable thrust developed by the propeller due to the non-uniform wake pattern in which it operates. The predominant periodic component of the thrust developed by a propeller occurs at blade-rate frequency, i.e., the number of propeller blades times the rotational frequency of the shaft. For a four-blade propeller running at 60 rev/min, what is the predominant periodic frequency that excites the longitudinal vibration of the propulsion shafting systems? (A)1 Hz (B)2 Hz (C)3 Hz (D)4 Hz

22.對於油濾器選用要求，下列敘述何者錯誤？
(A)濾心要有足夠的機械強度
(B)通油能力要好
(C)精度要求為最次要的考量條件
(D)要有抗腐蝕性

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