若复数z满足|z-3i|=1，求|z+2|的最大值______．

乘客电梯的特点是（）。

A.安全舒适

B.装饰美观

C.适用于工厂、仓库

D.速度一般在1m/s以下

水泥水化反应过程中（）。

A.吸收大量热

B.产生大量二氧化碳

C.产生大量热

D.不会产生热

London is the capital of the United Kingdom. It has about seven million people. The river Thames runs through London.

People from all over the world visit London to see Buckingham Palace, the Houses of Parliament, Westminster Abbey and the Tower of London. There are many museums, theatres and parks in London, as well as offices and factories. London began as a Roman settlement called Londinium. The plague(瘟疫) came to London in the 1600s, followed by the Great Fire of 1666. The city was badly bombed in World War II.

London is very slowly sinking into its foundations and the level of the river Thames is slowly rising. As a result, extra-high tides could flood a large part of London. To prevent this happening, a great barrier（屏障）has been built across the Thames at Woolwich. If very high tides happen, the barrier can be raised and London will be safe.

小题1:London is the capital of _________, which began as a __________ settlement.

A．England; Norman

B．UK; Frenchman

C．Scotland; English

D．UK; Roman小题2:According to the passage, from 1600 to now, ________ great disasters have happened in London.

A．one

B．two

C．three

D．four小题3:The reason why a great barrierhas been built across the Thames at Woolwich is that_________.

A．London is very slowly sinking into its foundations

B．the level of the river Thames is slowly rising

C．extra-high tides could flood a large part of London

D．all of the above.

一位同学查阅《申报》时看到以下报道：“□路方面消息，沪平通车昨日起北上车暂以济南为终点，南下车亦由济南开出，惟津浦客车则仍开至沧州，其以北之情形□不明□。南下各次车抵沪时，均甚拥挤。”（注：□表示字迹不清）该报道的历史背景是（）

A.红军转战陕北，国共军事对峙

B.日本全面侵华，平津局势吃紧

C.内战全面爆发，华北战事频繁

D.三大战役结束，长江以北解放

抽放泵（）管路中应设置甲烷传感器。