2011年4月1日~10月31日世界园艺博览会在中国西安举行.其理念为“绿色引领

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问题:

2011年4月1日~10月31日世界园艺博览会在中国西安举行.其理念为“绿色引领时尚”,回归自然、不事雕饰、绿色生活成为追求的时尚.自然馆(如图所示)是2011西安世园会的植物温室,主要展示地球上不同地域、不同气候带的珍稀植物及生态景观.建筑半埋地下,立面材料选用玻璃、木材与少量钢筋混凝土结合,倚山而建,层层叠叠,与地形完美结合,保证在建筑室内可以从不同标高领略湖面和对面花园的美景.请回答下列问题:

(1)木材属于______(填“天然材料”、“人造材料”中之一).

(2)玻璃的主要成分之一是硅酸钠(Na2SiO3),在硅酸钠中硅元素的化合价为______ 价.

(3)钢筋容易锈蚀,请写出一种防止铁生锈的方法:______.

(4)下列做法中,符合绿色化学理念的是______(填序号).

①猪饲料中掺入瘦肉精以获得更多的瘦肉

②自2011年5月1日起,禁止在面粉中添加增白剂

③为了可持续发展,将地沟油回收再利用.

考点:绿色化学化合价的求法金属的锈蚀与防护
题型:问答题

Visitors to this country are normally admitted for six months, but foreign students can usually stay for one year. They must (51) an educational institution, and they are required to study for a minimum of fifteen hours a week on a (52) course. Prospective students have to show that they can afford their studies, and that they have sufficient (53) resources to support themselves (54) in this country.

In order to work here the foreigner needs a work permit, (55) must be applied for by his prospective employer. The problem here is that the Department of Employment has the right to grant or (56) these permits, and there is little that can be done (57) it; it would be extremely unwise for a foreign visitor to work (58) a permit, since anyone doing so is liable to immediate deportation (驱逐出境). There are some people from the Common Market countries, who are often given (59) residence permits of up to five years. Some other people, such as doctors, foreign journalists, authors and others can work without permits, and foreign students are normally allowed to (60) part-time jobs while they are studying here.

58().

A.with 

B.before 

C.after 

D.without

题型:问答题

口服治疗量的维生素D治疗佝偻病其合理时间是

A.至佝偻病痊愈
B.至3岁
C.至骨骼体征消失
D.持续用1个月
E.持续用1年

题型:问答题

当出现突发事件、()或其他重大风险事件时,商业银行、保险公司应当密切配合,立即妥善处理,有效化解相关风险并及时向中国银监会、中国保监会报告。

题型:问答题

牙冠短小,力大,面无法制备出足够的空间。制作PFM全冠时金-瓷衔接线的位置应为()

A.在舌侧距龈缘2mm处

B.面距颊侧边缘嵴1mm处

C.舌侧距边缘嵴2mm处

D.中央沟处

E.颊侧距颈缘2mm处

题型:问答题

此患者首选的治疗用药为

A.叶酸

B.雄激素

C.长春新碱

D.阿糖胞苷

E.环磷酰胺

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