目前我市居民已经用上了由“西气东输”工程提供的质优价廉的天然气,天然气的主要成分

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问题:

目前我市居民已经用上了由“西气东输”工程提供的质优价廉的天然气,天然气的主要成分是(  )

A.甲烷

B.一氧化碳

C.氢气

D.乙醇

考点:化石燃料
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一个物体以角速度ω做匀速圆周运动时,下列说法中正确的是[ ]

A.轨道半径越大线速度越大

B.轨道半径越大线速度越小

C.轨道半径越大周期越大

D.轨道半径越大周期越小

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不符合开放性气胸病理生理的变化是

A.气管移向健侧
B.患侧胸膜腔压力与大气压相等
C.患侧胸膜腔压力大于健侧
D.纵隔向患侧移位
E.纵隔随呼吸左右摆动

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电信按传递信号的方向可分为模拟通信和数字通信。

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A How to Use a Painting Knife 使用画刀的方法
Painting with a knife is a bit like putting butter on bread and produces quite a (1) result to a brush. Painting knives are excellent for producing textured, impasto work and (2) areas of flat colour.
What’s the difference between a palette knife and a painting knife
A palette knife is a long, straight spatula that is used (3) mixing paints and scraping a palette clean. They’re made from metal, plastic, or wood and (4) either be completely straight or have a slightly bent handle. A painting knife has (5) large crank in the handle, which takes your hand away from the painting surface. They (6) in numerous shapes(for example pear-, diamond-, or trowel-shaped) and are used for painting (7) of a brush. The edge of the knife is blunt, so that it doesn’t cut the (8) .
·What shape of painting knife should I use
Different shaped painting knives produce different effects. For example, a short blade produces angular strokes (9)a long blade makes it easy to put down sweeps of colour.
·Why can’t I use a palette knife to paint with
You can. Painting (10) just have the advantage of coming in more angular shapes and with sharper points. And (11) larger crank in the handle means there’s less chance of rubbing your knuckles into wet (12) . If you’re unsure whether you’re going to enjoy painting with a knife, first buy a (13) , plastic palette knife and experiment a bit with this before upgrading to a wood-and-metal knife.
·How do I use painting knife
(14) the handle firmly so you’re got good control. Pick up some paint off your palette (15) the tip, as you’d pick up some butter with a knife. Use the side of the (16) to spread paint across your canvas, or press it onto the canvas, as you (17) spread butter across a slice of bread.It’ll seem strange at first as it’s quite (18) to using a brush. Using just the tip of the blade will produce small dots. (19) the edge of the knife down will produce fine lines. Pressing the blade flat down (20) the paint will produce ridges. Scrape back into the paint to reveal underlying layers (called sgraffito).

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某校高三2班在学习党的十七届六中全会和中央经济工作会议精神后,编制了下面的简报:

漫画“勿忘我”的哲学寓意是什么?请简要分析。

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