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【单选题】
当一位30-40岁的科研工作者显示出卓越的技术才能时,作为该科研人员的部经理,对他的最有效的激励应该是()
A.
高额奖金
B.
配备最好的研究条件
C.
提职
D.
精神奖励 ( 如评为劳模 )
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皮皮学刷刷变学霸
举一反三
【单选题】Now the air pollution in this city ______ more and more serious with each passing day.
A.
to become
B.
became
C.
becoming
D.
is becoming
【单选题】现浇钢筋混凝土框架结构中竖向钢筋的连接 ,宜采用( )
A.
闪光对焊
B.
电弧焊
C.
电渣压力焊
D.
电阻点焊
【简答题】设有一台500kVA、50Hz、三相变压器、Dyn连接(上列符号的意义为一次绕组接成三角形,二次绕组接成p42:2-3设有一台500kVA、50Hz、三相变压器、Dyn连接(上列符号的意义为一次绕组接成三角形,二次绕组接成星形并有中线引出),额定电压为10000/400V(上列数字的意义为一次额定线电压10000V,二次额定线电压为400V,以后不加说明,额定电压均指线电压); (1)试求一次额定...
【简答题】4-2 三绕组变压器的一次绕组接额定电压运行时,二次绕组负载发生的变化是否会对三次绕组的端电压产生影响?为什么?
【单选题】现浇钢筋混凝土框架结构中竖向钢筋的连接宜采用( )进行焊接。
A.
电渣压力焊
B.
闪光对焊
C.
电弧焊
D.
电阻焊
【单选题】Because of the reduction of air pollution, this city now is a good place ______.
A.
where to live
B.
which to live
C.
to live in
D.
to be lived
【单选题】Because of the reduction of air pollution, this city now is a good place ______.
A.
to live in
B.
to be lived
C.
where to live
D.
which to live
【简答题】SJL型三相变压器的铭牌数据如下:SN=180kV·A,U 1N =10kV,U 2N =400V,f=50Hz,Y/Y 0 连接,已知每匝线圈感应电动势为5.133V,铁心截面积为160cm 2 ,试求:(1)一、二次绕组每相匝数;(2)变压比;(3)一、二次绕组的额定电流;(4)铁心中磁感应强度B m 。
【单选题】Because of the reduction of air pollution, this city now is a good place _______
A.
where to live
B.
which to live
C.
to be lived
D.
to live
【简答题】As a result of pollution, Lake Erie, on the borders of the USA and Canada, is now without many living things. Pollution in water is not simply a matter of “poisons” killing large numbers of fish overn...
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