心形、耳垂形、箭形、楔形、戟形、圆形、下延形、偏斜形都属于叶缘形状的描述。( )

题型:判断题

问题:

心形、耳垂形、箭形、楔形、戟形、圆形、下延形、偏斜形都属于叶缘形状的描述。( )

考点:绿化工初级绿化工初级
题型:判断题

如图电路中,电源有内阻,线圈L的电阻可以不计,A、B两灯完全相同,C为电容器.下列判断中正确的有

[ ]

A. 在K1闭合,K2、K3断开的状态下,合上K2瞬间,B灯的亮度不受影响

B. 在K1、K2都闭合,K3断开的状态下,断开K1瞬间,B灯先变得更亮,然后逐渐熄灭

C. 在K1、K2断开,K3闭合的状态下,合上K1,A灯逐渐变亮,B灯立即变亮然后又稍稍变暗

D. 在K1、K3闭合,K2断开的状态下,断开K1,A、B灯都逐渐变暗,并同时熄灭

题型:判断题

— May I smoke here?

— If you ____, choose a seat in the smoking section. [ ]

A. should

B. could

C. may

D. must

题型:判断题

The laptop is a machine which can be a mobile office;it can be used to entertain us and people can play computer games on them. One machine can perform many tasks at the same time. As technology grows,the size of the new laptop machines is decreasing. Now laptops are lighter,have smaller screen sizes,and perform better. Smaller screen laptops,which are more convenient to take along with,have been specially designed for professionals. Huge display screen laptops are still used by graphic(绘画的)designers and those who like playing computer games.

Laptops are advanced machines,and they can be very expensive. When we spend much money on something,we should take good care of it. I know some people who buy a new laptop every year. The reason they do this is that the old one either is broken or has some problems which cannot be fixed. Common problems are the breaking of the screen,the breaking of joints of the laptop,display problems,and keyboard problems.

Different problems will always come up with machines,and they cannot be avoided(避免).Old machines will always have to be replaced by new ones. However,if we are more careful and handle our laptops with care,they will last for a longer period of time,and they will perform better. This is not a hard thing to do,but it will greatly increase the life and performance of laptops.

小题1:According to the first paragraph,the laptop is a machine which________.

A.is being used by more and more people in the office

B.will take the place of desktops sooner or later

C.is specially designed for people who like playing computer games

D.can be used for both work and entertainment purposes小题2:The underlined word in the first paragraph means “________”.

A.becoming smaller

B.becoming more important

C.becoming more popular

D.becoming better小题3:We infer that graphic designers still use huge display screen laptops most probably because________.

A.huge display screen laptops are very cheap

B.small display screen laptops are not on sale yet

C.they can see their drawings more clearly

D.they also want to play computer games小题4:What can we learn from the second paragraph?

A.That laptops can only be used for one year.

B.That laptops are not as good as desktops.

C.That the prices for laptops are too high.

D.That laptops may have problems which cannot be fixed.

题型:判断题

下列有关跨商品套利的说法,正确的是()。

A.跨商品套利仅仅是对一种商品的操作

B.跨商品交易是套利交易中最为简单的类型

C.跨商品套利的风险较低

D.出现套利机会的概率较大

题型:判断题

由内地检验检疫机构检疫合格后运到深圳出口的供港猪、牛、羊,必须随附由当地县级以上兽医卫生防疫站出具的熏蒸消毒证书。 ( )

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