关于SID-8BT-A型备用电源快切装置的事故切换说法正确的是()。A、事故切换由保

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问题:

关于SID-8BT-A型备用电源快切装置的事故切换说法正确的是()。

A、事故切换由保护接点启动;

B、保护启动接点可并接进线纵差保护发电机、变压器或发-变组保护出口接点;

C、当事故切换启动后,先发跳备用电源开关指令;

D、切换模式可以选择串联或同时。

考点:电厂电气专业继电保护技能鉴定考试电厂电气继电保护初级电厂电气继电保护初级题库
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概念模型一般用图纸表示,主要用于比较和分析,常用的方法有( )。 ①几何图形法;②等值线法;③方格网法;④图表法。

A.①②③④

B.①②③

C.①③④

D.②③④

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()是指在借款偿还期内的息税前利润与应付利息的比值。

A.投资率

B.偿债备付率

C.利息备付率

D.资产负债率

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下表是元素周期表的一部分

(1)表中元素⑩的氢化物的化学式为______,此氢化物的还原性比元素⑨的氢化物的还原性_________ (填“强”或“弱”)。

(2)已知某些不同主族元素的性质也有一定的相似性,如元素③与元素⑧的氢氧化物有相似的性质。写出元素③的氢氧化物与NaOH溶液反应的化学方程式:_________________________,又如表中与元素⑦的性质相似的元素是______(填元素符号)。

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Hunting with birds is a very old sport. In some countries the golden eagle is used for hunting wild animals. They are used for hunting foxes and wolves.

Training an eagle to hunt takes a long time. Hunters catch young eagles in nets made of hair. After being trained the eagle is taken to a field. A blindfold over the bird’s eyes keeps it quiet until the hunter is ready.

The eagle sits in the arm of the hunter. The hunter’s arm is covered with a long, special glove to protect it from the sharp claws of the bird. In the field, as soon as the hunter sees a fox or a wolf, he removes the blindfold. The eagle quickly flies into the air and began to look for the wild animal.

The eagle sees the animal and catches it with claws like steel. Its beak and claws are strong enough to hold the animal. Usually, the bird carries the animal back to the hunter. Sometimes fast animals with good eyes can get away.

61.A hunting eagle is trained when_________.

A.it is still young          B.it is taken to a field

C.its eyes are covered with a blindfold

D.the hunter is ready

62.Hunters use nets made of hair to ________.

A.train young foxes     B.catch young wolves

C.train young eagles    D.catch young eagles

63.The trained eagle_______.

A.carries the hunter home

B.wears a blindfold when hunting an animal

C.is covered with a long, special glove

D.has strong claws like steel

64.A hunter wears a special glove to _______.

A.protect his arm from the sharp claws of a trained eagle

B.protect his arm from the sharp claws of a young fox

C.protect his arm from the sharp claws of a young wolf

D.protect his arm from the sharp claws of wild animals

65.According to the text, which of the following is true?

A.Fast animals with sharp eyes are sometimes difficult to catch

B.As soon as the blindfold is removed, the eagle flies into a tree

C.Hunters always blindfold young eagles before training them.

D.Sometimes hunters train young foxes they have caught.

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感冒挟痰证,偏风寒者加用

A.保和丸
B.三拗汤及苏子
C.黛蛤散及桑白皮
D.葶苈子、代赭石
E.大黄、玄明粉、枳实

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