[单选题]被称为“史家之绝唱，无韵之离骚”的著作是( )。-我要搜题网

[单选题]Polyester (聚酯) is now being used for bottles. ICI, the chemicals and plastics company,believes that it is now beginning to break the grip of glass on the bottle business and thus take advantage of this huge market. All the plastics manufacturers have been experiencing hard times as their traditional products have been doing badly world-wide for the last few years. Between 1982 and 1984 the Plastics Division of ICI had lost a hundred and twenty million dollars, and they felt that the most hopeful new market was in packaging, bottles and cans. Since 1982 it has opened three new factories producing "Melinar", the raw material frown which high quality polyester bottles are made. The polyester bottle was born in the 1970s, when soft drinks companies like Coca Cola started selling their drinks in giant two-liter containers. Because of the build-up of the pressure of gas in these large containers, glass was unsuitable. Nor was PVC, the plastic which had been used for bottles since the 1960s, suitable for drinks with gas in them. A new plastic had to be made. Glass is still cheaper for the smaller bottles and will continue to be so, unless oil and plastic become much cheaper, but plastic does well for the larger sizes. Polyester bottles are virtually unbreakable. The manufacturers claim they are also lighter, less noisy when being handled, and can be reused. Shopkeepers and other business people are unlikely to object to a change from glass to polyester, since these bottles mean few breakages, which are costly and time-consuming. The public, though, have been more difficult to persuade. ICI's commercial department is developing different bottles with interesting shapes, to try and make them visually more attractive to the public. The next step could be to develop a plastic which could replace tins for food. The problem here is the high temperatures necessary for cooking the food in the container. ?Why is ICI's Plastics Division interested in polyester for bottles?
A.The other things they make are not selling well.
B.Glass manufacturers cannot make enough new bottles.
C.They have factories which could be adapted to make it.
D.The price of oil keeps changing.

查看答案

[单项选择]Eisenmenger综合征（）。
A. 肺性发绀
B. 心性混合性发绀
C. 淤血性发绀
D. 缺血性发绀
E. 混合性发绀

查看答案

[单项选择]下列关于我国武装力量的说法不正确的是( )。
A. 我国武装力量受中国共产党领导
B. 中国人民武装警察的职责中不包括防卫作战
C. 国务院、中央军委共同领导全国的国防动员工作
D. 我国武装力量由中国人民解放军现役部队及预备役部队、中国人民武装警察和民兵组成

查看答案

[多选题]预作用系统主要由()组成。
A.预作用报警阀组或雨淋阀组
B.充气设备
C.管道系统
D.给水设备和火灾探测报警控制装置

查看答案

[单项选择]对设备进行水压试验时，应保持室温在（）环境下进行，且试验完毕后立即将水放掉。
A. 10°C以上
B. 15°C以上
C. 20°C以上
D. 30°C以上

查看答案

[单选题]客车的固定轴距不宜过大或过小,一般取( )mm。
A.2400-2700
B.1400-1700
C.1400-1700
D.700-1400

查看答案

[单选题]作业现场风险等级等条件发生变化，应完善措施，重新办理作业票。（）
A.正确
B.错误
C.略
D.略
E.略
F.略