电压高于额定值运行时有哪些危害?

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问题:

电压高于额定值运行时有哪些危害?

考点:发电厂集控运行技术考试发电厂集控运行技术考试题库
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患者男性,65岁。既往高血压及吸烟史20年。2年前劳累时感到胸骨后压榨性疼痛,休息或含硝酸甘油5分钟内缓解。今晨突然胸骨后剧痛,休息并含硝酸甘油效果不佳,持续3小时,被急送医院。体格检查:面色苍白,出汗多,血压160/90mmHg,心率100次/分,律不齐,偶有早搏,余(-),心电图V1~V5ST段明显抬高,弓背向上,可见Q波。

为明确诊断还需要做的检查有()。

A.平板运动试验

B.胸导联心电图

C.肌钙蛋白

D.心脏彩超

E.肌酸磷酸激酶

F.血清淀粉酶

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a的一半与4.5的和用式子表示是

 [     ]

A.2a +4.5    

B.a÷2 +4.5    

C.2÷a+4.5   

D.(a+4.5)÷2

题型:问答题 简答题

Tim is third-grade pupil. Recently he failed in exams. When he     1.  

got his report , he was deep worried. The report should be signed by  2.   

his father in order that his father can know his poor work at school. On   3.   

the way to home, an idea appeared in his mind. When he got home, his 4 

father was reading a newspaper. Tim said jokingly,“Dad ,can you   5.   

write your name without your eyes shut?” His father repliedwitha smile 6.  

“I can try,son,give a pencil or a piece of paper.”As his father shut his eyes, 7.   

Tim placed a report on the table just beneath the pencil. “okey! His    8. 

father wrote his name in “a piece of paper”,The father went onreading  9.   

his paper and Tim was satisfied with the report sign by his father.    10. 

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Could you tell me___________?

A.who can help us organize the show

B.how long you have bought the car

C.what was your favorite subject

D.how many students are there in your class

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在资源管理器窗口用鼠标选择不连续的多个文件的正确操作方法是先按住Shift然后 逐个单击要选择的各个文件。()

A.正确

B.错误

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