某火力发电厂装有2×25MW机组,设有发电机母线,以35kV电压与3km外的220k

题型:单项选择题

问题:

某火力发电厂装有2×25MW机组,设有发电机母线,以35kV电压与3km外的220kV变电站35kV母线连接。电网供电,现扩建装设2×600MW机组,以500kV接入系统,若扩建机组厂用电率(未统计脱硫系统负荷)估算为5.8%。每台机组设一台引接于发电机出口的厂用分裂工作变压器(不含脱硫系统负荷),两台机组设一台启动/备用分裂变压器。

经技术经济比较该工程确定外引专用220kV线路作启动/备用电源,启动/备用变压器的中性点应( )。

A.经隔离开关接地;
B.隔离开关、避雷器及保护间隙并联接地;
C.直接接地;
D.B或C均可。

考点:注册电气工程师发输变电专业发电厂和变电所用电
题型:单项选择题

巴尔扎克《欧也尼葛朗台》中老葛朗台的性格特征是什么?举出一二个细节说明。

题型:单项选择题

改为一般疑问句

小题1:There are some offices in my school.

→________ there ________ offices in your school?

小题2:He can play basketball and tennis.

→________ he play basketball ________ tennis?

就划线部分提问

小题3:There are twenty-three desks in the classroom.

→________   ________ desks are there in the classroom?

小题4:Hamburgers are my favorite food.

→________   ________ favorite food?

用one或it补全句子

小题5:—Are there any dining halls in your school?

一Yes,there is ________ over there.

小题6:This is my cat.I like ________ very much.

用所给代词的适当形式填空

小题7:Hi,Jack.This is________ (I)friend.________(he)name is Sam.

小题8:Are Tom and Jack there? Can I speak to ________ (they)?

合并句子

小题9:Beef is healthy food.Ice cream isn’t healthy food.

→Beef is healthy food ________ ice cream isn’t healthy food.

小题10:My uncle is 35 years old.He is a hotel manager.

→My uncle is 35 years old ________ he is a hotel manager.

题型:单项选择题

无创通气的适应证包括()

A.不必施行有创通气的急慢性呼吸衰竭的治疗

B.阻塞性睡眠呼吸暂停综合征

C.撤离有创机械通气过程中

D.肺水肿的治疗

E.不能控制的胃肠道出血

题型:单项选择题

急性肾小球肾炎可出现( )

A.脓血便
B.鲜血便
C.柏油样便
D.白陶土样便
E.稀糊状便

题型:单项选择题

戴上颌义齿后恶心、唾液增多有下列原因,除了

A.义齿基托后缘过长
B.义齿基托后缘过短
C.义齿基托后缘过厚
D.义齿基托后缘不贴合
E.初戴不适应

更多题库