混凝土抗折强度是指混凝土的抗弯拉强度。

诊断肺炎球菌肺炎哪一症状价值最大（）

A.寒战

B.持续高热

C.咳嗽、呼吸困难

D.胸痛

E.咯铁锈色痰

某学校研究小组从废干电池筒内的物质（含有C、MnO₂、ZnCl₂、NH₄Cl等）进行回收MnO₂实验，过程如下：

（1）操作①、②、③依次为下图中的（填字母）_________．

（2）操作②后要进行洗涤，判断洗净的方法是：取最后一次洗涤液，加入_________，如果不生成白色沉淀，则说明已洗净．操作③中发生反应的化学方程式为_________

（3）为检验获得的MnO₂，可在试管中加入获得的MnO₂和适量5%的过氧化氢溶液混合，反应化学方程式为_________，在试管口用_________．

For more than ten years John Grimshaw has been pioneering a gentle revolution. He aims to get us going by bike on Britain’s network of disused railways. He works as an engineer for Sustrans, a Bristol-based charity.

He believes that there is no benefit or logic behind the building of bigger and faster roads that only encourage people to use cars more extravagantly(过分地). Britain’s roads being built ignore all but the motorists while miles of railway tracks no longer used by trains lie wasted.

His organization started work in 1994 with a modest five mile track from Bristol to Bath, and cyclists and walkers now make a million journeys a year on the path. Sustrans has since completed a further 150 miles throughout Britain with the help of volunteer workers.

Building such paths is not easy or cheap. Sustrans buys or leases(租借) land from British Rail and the paths can cost from 6,000 pounds up to 8, 0000 pounds per kilometer to build. Money comes from central and local government, charity bodies and gifts from individuals.

To encourage more walkers and cyclists along its paths, Sustrans plans to construct a work of art on every mile of path it builds. Most of their tracks quickly transport people from the city to the countryside. The latest route runs from the heart of Glasgow to Loch Lomond. Relics (遗迹)of the great railway age litter the routes—station houses, signals boxes and even steam trains.

Some might consider John Grimshaw a traveler from the past, out of touch with the modern world, but for many he is preparing the way for an alternative for a car-mad world.

小题1:The aim of Sustrans is to _________.

a. encourage people to use cars more efficiently

b. use old railway lines for leisure purposes

c. provide a cycling network across Britain

d. build better and faster roads

小题2:How does Sustrans finance its work?

a. with a mixture of money from the government and donations

b. with money from British Rail

c. by leasing its land

d. by using volunteer workers

小题3:Which of the following is TRUE?

a. Sustrans will not build any more tracks after Glasgow to Loch Lomond

b. Sustrans will have to clear the track of relics

c. Sustrans makes the countryside more accessible to the public

d. Sustrans believes more drivers will use their tracks.

在城市黄线范围内禁止进行的活动，包括( )。

A．违反国家有关技术标准和规范进行建设

B．违反保护规划的大面积拆除、开发

C．未经批准，改装、迁移或拆毁原有城市基础设施

D．其他损坏城市基础设施或影响城市基础设施安全和正常运转的行为

E．擅自建设各类排污设施

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