什么叫冷油流速?油品在炉管内流速大小不同有何影响?改变流速的措施有哪些?
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继电保护装置定期检验可分为__________、___________、用装置进行断路器跳合闸试验。
在屋外变电所和高压室内搬运梯子、管子等长物应由()进行,并保持安全距离。
A. 1人;
B. 2人;
C. 3人;
D. 4人。
添加()剂时,对不同油品要先作感受性试验,应在油品的晶粒未形成之前加入。
A. 指示
B. 降凝
C. 抗氧化
You are in charge of a stand-on vessel in a crossing situation.The other vessel is 1.5 miles to port.You believe that risk of collision exists.You should().
A. take avoiding action immediately upon determining that risk of collision exists
B. immediately sound the danger signal
C. take avoiding action only after providing the give-way vessel time to take action ,and determining that her action is not appropriate
D. hold course and speed until the point of extremis, and then sound the danger signal, taking whatever action will best avert collisio