简述商法的性质。

如图所示，组成一种原电池．试回答下列问题(灯泡功率合适)

（1）电解质溶液为稀H₂SO₄时，灯泡_______(填“亮”或“不亮”，填“亮”做a题，填“不亮”做b题)．

a.若灯泡亮，则Mg电极上发生的反应为_______________；Al电极上发生的反应为_______________．

b.若灯泡不亮，其理由为：_________________________________．

（2）电解质溶液为NaOH(aq)时，灯泡__________(填“亮”或“不亮”, 填“亮”做a题，填“不亮”做b题)．

a.若灯泡亮，则Mg电极上发生的反应为_______________；Al电极上发生的反应为_______________．

b.若灯泡不亮，其理由为：________________________．

Once there was a man who liked to eat mangoes. One day he decided to get the sweetest mango from the very top of the tree. Mangoes which are exposed to the sun the most are the sweetest.

So he climbed up to the top, where the branches were thin. He managed to pick up a few sweet reddish fruits, but, in an attempt to climb down, he slipped and started falling towards the ground. Fortunately, he caught the branch as he was falling and remained helplessly hanging on the tree. Then he started to call nearby villagers for help. They immediately came with a ladder and sticks, but could do little to help him.

Then after some time one calm and thoughtful person arrived – a well-known sage who lived in a simple hut nearby. People were very curious to see what he would do, as he was famous in solving many people’s problems in the area and sometimes very complicated ones.

He was silent for a minute and then picked up a stone and threw it at the hanging man.

Everybody was surprised. The hanging mango lover started to shout, “What are you doing?! Are you crazy? Do you want me to break my neck?” The sage was silent. Then he took another stone and threw it at the man. The man was very angry, “If I could just come down, I would show you!”

That’s what everybody wanted – that he came down. But how? Now everybody was tense, as to what would happen next! Some wanted to chastise the sage, but they didn’t. The sage picked another stone and threw it again at the man, even more forcefully. Now the man on the tree was enraged and developed a great determination to come down and take revenge（复仇）.

He then used all his skill and strength and somehow reached the branches which were safe to start going down. And he made it! Everybody was amazed.

However, the rescued man found the sage gone. He stood there, realizing that the man really saved him because he induced（引诱）him to try his best and save himself.

“I should be thankful and not angry.”

小题1:From the story we know that the sweetest mango must be the one        .

A．on the very top of the tree

B．hidden in the middle of a tree

C．on the tree for the longest time

D．exposed to sunlight less often小题2:What happened after he had picked a few sweet reddish mangoes?

A．He slipped and fell to the ground suddenly.

B．He was climbing down quickly

C．He remained hanging helplessly on the tree.

D．He shouted loudly for help but no one helped.小题3:How did the man feel when the sage hit him with a stone?

A．He was nervous.

B．He kept silent

C．He felt surprised.

D．He was angry.小题4:What do you think motivated the man to climb down?

A．Courage.

B．Revenge.

C．Carefulness.

D．Assistance.

某单层单跨无吊车厂房采用装配式无檩体系屋盖，其纵横承重墙采用MU10烧结普通砖，砖柱柱距5.1m，车间长30.6m，两端设有山墙，每边山墙上设有4个240mm×240mm构造柱如图所示。自基础顶面算起墙高3.6m，壁柱为370mm×250mm，墙厚240mm，M7.5混合砂浆。砌体施工质量控制等级为B级。

该厂房山墙的高厚比验算，β≤μ₁μ₂[β]，其左右端项，与下列何项数值最为接近（）。

A．β=17.04＜22.7

B．β=15.0＜22.7

C．β=15.0＜20.8

D．β=16.7＜27.6

下列属于股东投资指标的是( )。

A．毛利率

B．市盈率

C．市净率

D．资本报酬率

配料时应掌握软配软、（）的原则。