29.冷凍裝置中低壓切斷開關可以防止下列何者壓力過低？ (A)排氣 (B)吸氣 (C)滑油 (D)冷卻水

29.冷凍裝置中低壓切斷開關可以防止下列何者壓力過低？
(A)排氣
(B)吸氣
(C)滑油
(D)冷卻水

答案：登入後查看
統計： A(47), B(245), C(119), D(24), E(0) #601700

私人筆記 (共 1 筆)

許允真

2025/01/03

私人筆記#6623855

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冷凍裝置中的低壓切斷開關的主要功能是防止...

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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

29.冷凍裝置中低壓切斷開關可以防止下列何者壓力過低？
(A)排氣
(B)吸氣
(C)滑油
(D)冷卻水

私人筆記 (共 1 筆)

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