搜题请搜索小程序“爱下问搜题”
问题 多项选择题

不同类型主体的货币需求变化表现在( )

A．主体货币需求量的变化

B．购买动机的变化

C．保存货币准备金进行投资盈利的目的变化

D．安全和预防动机需求的变化

E．贮藏货币保值的作用在变化

答案

参考答案：A,B,C,D,E

解析： 主要考查的知识点为不同类型主体的货币需求变化。
[要点透析] 我国自改革开放以来，各主体无论是货币需求量，还是货币需求动机，都发生了很大的变化：(1)主体货币需求量的变化。(2)主体货币需求动机的变化：①购买动机的变化。②安全和预防动机需求的变化。③保存货币准备金进行投资盈利的目的变化。(3)贮藏货币保值的作用在变化。

计算题

如图所示，电阻忽略不计的、两根两平行的光滑金属导轨竖直放置，其上端接一阻值为3Ω的定值电阻R。在水平虚线L1、L2间有一与导轨所在平面垂直的匀强磁场B，磁场区域的高度为d=0.5m。导体棒a的质量ma=0.2kg、电阻Ra=3Ω；导体棒b的质量mb=0.1kg、电阻Rb=6Ω，它们分别从图中M、N处同时由静止开始在导轨上无摩擦向下滑动，都能匀速穿过磁场区域，且当b刚穿出磁场时a正好进入磁场。设重力加速度为g=10m/s2，不计a、b棒之间的相互作用。导体棒始终与导轨垂直且与导轨接触良好。求：

（1）在整个过程中，a、b两棒分别克服安培力所做的功；

（2）导体棒a从图中M处到进入磁场的时间；M点和N点距L1的高度。

查看答案
填空题


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).

查看答案