问题 问答题 简答题

简述干熄焦汽轮机解列的操作步骤?

答案

参考答案:

操作ADJ键降负荷,将负荷降到2.0左右。

两人同时操作:

①一人继续降负荷到0.7~0.8。

②一人操作数字励磁控制柜自动/手动,先打到手动,再减磁到通道画面中Q值到0.3~0.4之间。

2SA打到就地,发电机监控保护屏控制开关2SC合/分,打到分闸。

继续减磁到0。

切断通道。

从右到左关闭交流电源、直流电源、励磁输入、励磁输出。

单项选择题
单项选择题

Lying in the sun on a rock, the cougar saw Jeb and his son, Tom, before they saw it. Jeb put his bag down quickly and pulled his jacket open with both hands, making himself look big to the cougar. It worked. The cougar hesitated, ready to attack Jeb, but ready to forget the whole thing, too.
Jeb took off his jacket, grasped Tom and held him across his body, making a cross. Now the cougar’s enemy looked even bigger, and it rose up, ready to move away, but unfortunately Tom got scared and struggled free of Jeb.
"Tom, No !" shouted his father.
But Tom broke and ran and that’s the last thing you do with a cougar. The second Tom broke free, Jeb threw himself on the cougar, just as it jumped from the rock. They hit each other in mid air and both fell. The cougar was on Jeb in a flash, forgetting about Tom, which was what Jeb wanted. Cougars are not as big as most people think and a determined man stands a chance, even just with his fists. As the cougar’s claws got into his left shoulder, Jeb swung his fist at its eyes and hit hard. The animal howled(吼叫) and put its head back. Jeb followed up with his other fist. Then out of the corner of his eye, Jeb saw Tom. The boy was running back to help his father.
"Knife, Tom," shouted Jeb.
The boy ran to his father’s bag, while Jeb started shouting as well as hitting, to keep the cougar’s attention away from Tom. Tom got the knife and ran over to Jeb. The cougar was moving its head in and out, trying to find a way through the wall. Jeb was making out of his arms. Tom swung with the knife, into the cougar’s back. It howled horribly and ran off into the mountains.

Why did Jeb pull his jacket open when he saw the cougar

A.To get ready to fight.

B.To frighten it away.
C.To protect the boy.

D.To cool down.