下列运算结果为m2的式子是( ) A.m6÷m3 B.m4•m-2 C.(m-1

题型:选择题

问题:

下列运算结果为m2的式子是( )

A.m6÷m3

B.m4•m-2

C.(m-12

D.m4-m2


考点:有理数除法有理数的乘方
题型:选择题

血氨升高常见于()

A.尿毒症

B.上消化道出血

C.肝性脑病

D.贫血

E.低蛋白饮食

题型:选择题

王强家地里菜叶发黄。周日,爸爸叫王强去买20kg化肥硝酸铵(NH4NO3),当他赶到商店时,硝酸铵刚好卖完,于是他决定购买尿素CO(NH2)2。王强要买         千克尿素才能与20kg硝酸铵的肥效相当(保留整数).

题型:选择题

下列关于工作分解结构的表述中,正确的有()。

A.工作分解结构是分层划分的树状结构

B.工作分解结构是工作定义的基本依据

C.不同项目的工作分解结构不应该类同

D.工作分解结构通过子单元来表达主单元

E.工作定义的成果包括修正的工作分解结构

题型:选择题

A long time ago, there was a seed and because he was only a seed, nobody noticed him.Thus, feeling inferior (低等的), the seed gave no importance to his existence (存在).

Then one day, a wind picked him up and threw him on an open field under the sun.Later, he was given rain.

Years later he saw a traveler sitting by his side.“Thank God for this.I really need some rest,” he heard the traveler say.

“What are you talking about?” the seed quickly asked.He thought the man was making fun of him.No one ever spoke to him like that.

“Who just spoke?” the shocked man asked.

“It is me.A seed.”

`“A seed?” The man looked at the big tree.“Are you joking? You are not a seed.You are a big tree!”

“Really?”

“Yes! Why else do you think people come here?”

“What do they come here for?”

“To feel your shade (树荫)! Don’t tell me you didn’t know you had grown over time.”

A moment passed before the traveler’s words brought him pride.

The seed thought and smiled for the first time in his life.The years of torture (折磨) by the sun and the rain finally helped him grow up.

“Oh! That means I’m not a little seed anymore! I was actually born to make people feel comfortable.Wow! That’s great!”

小题1:The seed didn’t realize the importance of his existence because ______.

A.nobody looked after him

B.he was thrown into the open air

C.he was such a small seed

D.he didn’t believe in himself小题2:The traveler sat by the seed’s side to ______.

A.escape from the rain

B.thank God for offering him a tree

C.have a rest and enjoy the shade

D.talk with the big tree小题3:The author’s purpose of writing the passage is to ______.

A.tell us that we should help each other

B.praise the seed for his strength

C.teach us not to laugh at others

D.tell us never to lose hope小题4:Where does the passage most probably come from?

A.A history book.

B.A science book.

C.A storybook.

D.A novel.

题型:选择题

异核现象(heterokaryosis)

更多题库