下面哪些方法可选中一个图层（）？A、若要选中多个图层，按shift同时单击要选择的层

甲、乙签订一买卖合同，甲向乙购买机器5台及附带的维修工具，机器编号分别为E、F、G、X、Y，拟分别用于不同厂区。乙向甲如期交付5台机器及附带的维修工具；经验收，E机器存在重大质量瑕疵而无法使用，F机器附带的维修工具亦属不合格品，其他机器及维修工具不存在质量问题。根据《合同法》的规定，下列关于甲如何解除合同的表述中，正确的是（　）。

A．甲可以解除5台机器及维修工具的买卖合同

B．甲只能就买卖合同中E机器的部分解除

C．甲可以就买卖合同中E机器与F机器的部分解除

D．甲可以就买卖合同中F机器的维修工具与Ｅ机器的部分解除

王某，女，31岁。右眼下睑红肿疼痛3天，硬结如绿豆大，焮痛拒按，口渴喜饮，便秘溲黄，舌红苔黄，脉洪数。宜在主穴基础上加取（）。

A.大椎、行间

B.行间、侠溪

C.外关、中渚

D.少商、上星

E.内庭、曲池

In many cultures white is often associated with something positive. A white-collar job, for instance, is the kind of job many people look for, working with your brain and not your hands.

White has a clean and pure image. That is why doctors, dentists, and nurses usually wear white uniforms. Babies are dressed in white at baptisms（洗礼）and brides wear white wedding gowns at weddings. White in these cases is the symbol of innocence or purity.

Sometimes white is used in expressions that are not good. “Whitewash” is one such expression. At first, “whitewash” meant to paint over something with white paint to make it look better. However, it means something different today: to hide or to cover up mistakes or failures.

A “white elephant” is another example of white used in a negative way. In ancient Thailand, a white elephant was regarded as a sacred animal, but it was very expensive to keep. The kings of those days presented a white elephant to the people they wanted to ruin. Once they received this holy, royal animal as a gift, they were not allowed to sell or kill it. Today, a “white elephant” means something that is big, useless, and unwanted. In America, when people want to get rid of their furniture or clothes, they often have a “white elephant sale”.

小题1:The text is mainly about________.

A．the meanings of white in English culture

B．the history of some English idioms

C．some interesting customs in English culture

D．some useful English words and expressions小题2:Which expression has an historical background ?

A．White-wash.

B．White-collar.

C．White elephant.

D．White elephant sale.小题3:In which statement does “white” have a negative meaning?

A．A boy is dressed in white at baptisms.

B．A bride wears a white wedding gown.

C．A man whitewashes his crime.

D．A girl finds a white collar job.小题4:From the text we can learn that _______.

A．a white-elephant sale is useful to the poor

B．the white color is important in our daily life

C．a white-collar job used to be easy to get

D．expressions with white have different meanings小题5:The author develops the text mainly by ______.

A．analyzing its cause and effect

B．providing typical examples

C．comparing different ideas

D．following the time order

甲、乙两种不含结晶水的固体物质的溶解度曲线如图所示。根据图示判断，下列说法中，不正确的是

A．在t₁℃时，甲、乙两物质饱和溶液溶质的质量分数相等

B．甲、乙两种物质的溶解度都随温度的升高而增大

C．将t₁℃时乙的饱和溶液升温到t₂℃时，溶质的质量分数一定增大

D．将t₂℃时甲物质的饱和溶液降温，会析出晶体

关于属性查询命令，下面说法不正确的是（）

A.从上往下框选可选中同编号构件

B.从下往上框选可选中同类型构件

C.两个框选方式都可选中所有构件