Great British is an island that lies off the northwest coast of Europe. The nearest country is France which is 20 miles away. Great British is separated from France by the English Channel. The island is surrounded by the Atlantic Ocean, to the west, and the North Sea, to the east. It includes the main lands of England, Wales and Scotland. Scotland is in the north while Wales is in the west. Ireland, which is also an island, lies off the west coast of Great Britain. It is made up of Northern Ireland and the Irish Republic. Great Britain together with Northern Ireland forms the United Kingdom (U.K.). So the U.K. is made up of four countries. The largest of these is England which is divided into 43 countries. The capital city is London which is on the river Thames.
【小题1】Great Britain is separated from France by_______.
| A．the North Sea/ N1 b% h6 K; j+ ?0 P" j6 h1 R3 O | B．Suez Canal |
如图所示，四个相同的电灯与理想自耦变压器连接，当接上交流电源后，四个电灯均正常发光，则初级与次级的电压之比U1：U2为（ ）
