如下图：方格纸上有一只小虫，从直线AB上的一点O出发，沿方格纸上的横线或竖线爬行。方

某化学药品含碳71.58%，含氢6.67%，含氮4.91%，其余为氧（质量分数）．又知其相对分子质量不超过300．试求：

（1）该化学药品的相对分子质量． 

（2）该化学药品的化学式．

酒精燃烧法的述说，错误的是（）。

A．本试验法适用于快速简易测定细粒土

B．所用酒精纯度为90%

C．实验时用滴管将酒精注入有放有试样的称量盒中，直至盒中酒精出现自由面为止

D．点燃盒中酒精，燃至火焰熄灭，将试样冷却数分钟后，再次加入酒精，重新燃烧，共燃烧三次

Events

Long March exhibit

The Shanghai History Museum is putting on an exhibition to mark the 60th anniversary    of the Long March．On show are more than 220 photos and 40 items that explain with pictures how the communist Red Army drew back from its besieged(被围困的)bases in Jiangxi Province and fought its way to northern Shanxi province in the mid-1930s．Explanations are all in  Chinese，The show will end on November 20．

Time：      10：00 am—4：00 pm.

Address：    1286 Hongqiao Road

Admission：  8 yuan for Chinese／15 yuan for foreigners

Thai elephants

Eight elephants from Thailand are entertaining visitors at Changfeng Park by riding bikes，

playing basketball，balancing on a beam，dancing and blowing a mouth-organ．People are encouraged to have a tug-of-war with the animals or lie on the ground and have the elephants walk over them，The elephants give three shows a day at 9：30 am,3：30 pm and 8:00 pm and there is an additional show at l：30 pm at weekends.The show will end on November 15。

Address：    189 Daduhe Road

Admission：  30—40 yuan

Dancing dolphins

Dolphins jumping from the water to touch a ball，swaying their bodies to music，kissing people and doing maths by tapping their tails have made the dolphinarium in Peace Park an attraction for children．Seals and sea lions also perform。

Hours：      10：30 am，4：00pm，and 7：30prn

Admission：  20 yuan for adults and 10 yuan for children．

45．If you go to visit the Long March exhibit with an Australian，how much will you pay altogether for the admission?

A．16yuan      B．23 yuan        C．30yuan      D．20yuan

46．At the exhibition，you will see        

A．many articles written by famous writers  

B．many things left by the Red Army,

C．books on the Long March        

D．many photos and pictures about the Long Match

47．Which of the following is NOT done by the Thai elephants?

A．Riding bicycles。    B．Blowing a mouth-organ

C．Doing maths        D．Having a tug-of-war with people．

48．The dolphinarium in Peace Park is a hall where you can see            

A．not only dolphins but also seals and sea lions perform

B．only seals and sea lions perform

C．only dolphins perform

D．only seals perform

背景：北方某大学新校区工程建筑面积89010m2，由教学综合楼、学生活动中心和餐厅三部分组成。.框架现浇混凝土结构。学生活动中心为条形基础，地上4层，首层阶梯报告厅局部层高21m，模板直接支撑在地基土上。施工单位为某施工总承包企业。 

施工过程中发生了如下事件： 

事件一：学生活动中心首层阶梯报告厅顶板模板工程验收中，项目经理发现在最顶步距两水平拉杆中间加设了一道水平拉杆;水平拉杆的端部与四周建筑物间隔lOOm。安全总监下达了整改通知。 

事件二：餐厅首层顶板模板工程施工中，由于立杆间距过大，导致钢管支架整体失稳。项目部及时采取了处理措施，避免了质量安全事故的发生。 

模板设计无要求时，模板拆除的顺序和方法是什么?

在许多船锚泊的锚地上抛锚时，宜选择在他船的那一侧抛锚（）？

A.船尾

B.下风舷一侧

C.下流一侧

D.视具体情况而定