使用煤气应注意哪些安全问题?

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问题:

使用煤气应注意哪些安全问题?

考点:炉外精炼工初级炉外精炼工初级炉外精炼工题库
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一位老干部每月工资扣除3500元后的余额为1000元,按3%纳税30元.其中应纳税额为______元,税率为______

A.3500 B.1000 C.30 D.300 E.3%

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下列各项,既是“亚洲之最”,又是“世界之最”的是[ ]

A.最长的河流--长江

B.最大的高原--青藏高原

C.最大的湖泊--里海

D.最大的平原--西西伯利亚平原

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2008年以来,非洲索马里沿海累计已经发生80多起海盗袭击事件,海盗已猖獗到无以复加的地步。这一地区在15世纪末就出现过一个著名的“海盗”,他是

A.迪亚士

B.哥伦布

C.麦哲伦

D.达·伽马

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Marks & Spencer has a very good reputation for job security and looking after its staff, with things like good perks, (1) , that sort of thing. Do those things actually (2)
I think it is, it is very important. When people have been working (3) , and they may have been in from seven or eight o’clock in the morning, they can come off the sales floor and can go to (4) and obviously they can have tea, coffee, or (5) , and can then buy at very reduced rates (6) , if they want one, or a roll and cheese, in a pleasant environment, (7) , food of the highest quality, there’re areas where they can (8) , or play pool or something, yeah, that is very important because they need (9) . At busy times, they need to get away from it, they need to be able to relax. In terms of all the (10) we’ve got, that is very important, when people know that they will be having medicals, and (11) is another thing, obviously there’s (12) that they will buy which they will be able to buy (13) . For Christmas bonus, we give all our general staff (14) which is guaranteed, and the (15) of that, actually, at the busiest time of the year when they’re (16) and working hard, is fantastic and to see their faces as you (17) with 10% of their salary in it. I believe the environment that you work in, (18) that you work with, the way you are treated, (19) , and the fact that your views are listened to, and you feel you are consulted, that makes people (20) and makes them get up and come to work in the morning.

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下图表示环境变化对不同生物群落的影响。相关叙述合理的是()

A.群落甲物种单一,只具有水平结构

B.随着环境的变化,群落乙出现的波动较大

C.群落甲、乙均具备一定的缓冲外来冲击的能力

D.群落甲中任一物种的消失必会破坏整个系统的稳定性

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