Which of the following actions should be taken if during a routine maintenance inspection of a centrifugal pump, localized scoring on a pump shaft sleeve is detected?()
A. Correct the cause of the scoring and repair the sleeve or replace with a new one
B. Reassemble the unit and provide more water leak off for proper lubrication
Check for parallel alignment of the sleeve radial faces to the sleeve bores
D. Reassemble the unit and adjust the governor to obtain a slower speed
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()是利用微处理器的数字输出来对模拟电路进行控制的一种非常有效的技术,广泛应用在从测量、通信到功率控制与变换的许多领域中。
A. 脉冲编码调制
B. 脉冲宽度调制
C. 脉冲模拟调制
D. 脉冲振幅调制
某轮在航行途中因电线走火,第三舱内发生火灾,经灌水灭火后统计损失,被火烧毁货物价值5000美元,因灌水救火被水浸坏货物损失6000美元。船方宣布该轮共同海损 被火烧毁的货物损失5000美元船方是否应负责赔偿,理由是什么?