民事法律行为是民事主体基于( )设立、变更和终止民事权利义务的合法行为。A．意思表

柱塞泵流量的测量及计算方法应按（）进行。

A、水泵测量的测定方法

B、企业自身规定的方法

C、一般水泵测量的测定方法

D、自行确定方法

You may not pay much attention to your daily elevator ride. Many of us use a lift several times during the day without really thinking about it. But Lee Gray, PhD, of the University of North Carolina, US, has made it his business to examine this overlooked form of public transport. He is known as the “Elevator Guy”.

“The lift becomes this interesting social space where etiquette (礼仪) is sort of odd (奇怪的),” Gray told the BBC. “They [elevators] are socially very interesting but often very awkward places.”

We walk in and usually turn around to face the door. If someone else comes in, we may have to move. And here, according to Gray, liftusers unthinkingly go through a set pattern of movements. He told the BBC what he had observed.

He explained that when you are the only one inside a lift, you can do whatever you want – it’s your own little box.

If there are two of you, you go into different corners, standing diagonally (对角线地) across from each other to create distance.

When a third person enters, you will unconsciously form a triangle. And when there is a fourth person it becomes a square, with someone in every corner. A fifth person is probably going to have to stand in the middle.

New entrants to the lift will need to size up the situation when the doors slide open and then act decisively. Once in, for most people the rule is simple – look down, or look at your phone.

Why are we so awkward in lifts?

“You don’t have enough space,” Professor Babette Renneberg, a clinical psychologist at the  Free University of Berlin, told the BBC. “Usually when we meet other people we have about an arm’s length of distance between us. And that’s not possible in most elevators.”

In such a small, enclosed space it becomes very important to act in a way that cannot be construed (理解) as threatening or odd. “The easiest way to do this is to avoid eye contact,” she said.

小题1:The main purpose of the article is to _____.

A．remind us to enjoy ourselves in the elevator

B．tell us some unwritten rules of elevator etiquette

C．share an interesting but awkward elevator ride

D．analyze what makes people feel awkward in an elevator小题2:According to Gray, when people enter an elevator, they usually _____.

A．turn around and greet one another

B．look around or examine their phone

C．make eye contact with those in the elevator

D．try to keep a distance from other people小题3:Which of the following describes how people usually stand when there are at least two people in an elevator?

小题4:The underlined phrase “size up” in Paragraph 7 is closest in meaning to _____.

A．judge

B．ignore

C．put up with

D．make the best of小题5:According to the article, people feel awkward in lifts because of _____.

A．someone’s odd behaviors

B．the lack of space

C．their unfamiliarity with one another

D．their eye contact with one another

在四个相同的烧杯中分别盛以水和某种液体并用完全相同的电热水器加热，测出它们的温度和通电时间记入下表：

序号	液体	质量（g）	初温（℃）	末温（℃）	加热时间（t）
1	水	100	10	15	1
2	水	200	10	15	2
3	水	200	10	25	6
4	某液体	200	10	25	3

（1）实验中选用相同的电热水器的目的是：______．

（2）比较①、②两组数据可得：物体吸收的热量跟______有关；比较______两组数据可得：物体吸收的热量跟升高的温度有关．比较③④两组数据可得：物体吸收的热量还跟______有关．

（3）从表中的数据可得某液体的比热容为______ J/（kg•℃）．

电客车越站的规定？

建筑外墙防水工程技术规程（JGJ/T235-2011）外墙防水应按照外墙面积（）为一个检验批

A.400㎡

B.500㎡~1000㎡

C.800㎡~1500㎡

D.1500㎡