从同一点沿水平方向抛出的甲、乙两个小球能落在同一个斜面上,运动轨迹如图所示,不计

题型:选择题

问题:

从同一点沿水平方向抛出的甲、乙两个小球能落在同一个斜面上,运动轨迹如图所示,不计空气阻力,下列说法正确的是(  )

A.甲球下落的时间比乙球下落的时间长

B.甲球下落的时间和乙球下落的时间相等

C.甲球的初速度比乙球初速度大

D.甲球的初速度比乙球初速度小

考点:平抛运动
题型:选择题

根据《素问•痹论》的内容,痹聚在肾的原因是()

A、淫气喘息

B、淫气忧思

C、淫气遗溺

D、淫气乏竭

E、淫气肌绝

题型:选择题

肾上腺髓质分泌()

A.雄激素

B.抗利尿激素

C.糖皮质激素

D.盐皮质激素

E.去甲肾上腺素

题型:选择题

空气中供我们呼吸的气体是(  )

A.氧气

B.氮气

C.水蒸气

D.稀有气体

题型:选择题

Dad came in the midnight. We heard every sound, but we pretended to be asleep.

Next morning he looked weak and thin, sitting in a chair by the kitchen fire. The light of the fire shone through his long empty sleeve. Everything went as usual. Grandma found something to do in the bedroom. Grandpa went out for some water. Mother, with her back to us, was getting the cakes ready for breakfast.

But nothing was right. When grandma came out of the bedroom, she walked on tiptoe. When grandpa came back, he said nothing about the weather. At breakfast Mother passed us the fruit and said something, but her voice was too high.

At last my sister, Lou, pushed back her chair. “It’s your turn to wash the dishes.” But I had washed the dishes the night before. I said nothing because it was not right to quarrel in front of Dad just home with the empty sleeve.

“It is your turn,” Lou said again. I looked at her in surprise.

“It is not,” I said because I suddenly remembered Mother had told us to go on as usual.

“Children, children,” Mother said in a quiet, glad kind of voice.

And Dad was smiling because he felt at home at last.

小题1:What do you know happened to Dad in the story?

A.He was badly ill.

B.He had a long journey.

C.He drank too much.

D.He lost one of his arms.小题2:The family        when they saw Dad’s empty sleeve.

A.was too surprised to do anything

B.felt sad and cried a lot

C.tried not to show their feelings

D.showed no worry at all小题3:From the story, we know          .

A.the two sisters often quarreled about who should wash the dishes

B.the family liked seeing the two sisters quarrelling after breakfast

C.Dad loved the two sisters very much though they often quarreled

D.Mother told the two sisters to quarrel with each other the night before小题4:Which of the following can be the best title of the story?

A.The Quarrelling Sisters

B.Dad Was Back

C.After the Accident

D.An Empty Sleeve

题型:选择题

荨麻疹的发病机制主要有免疫性和非免疫性两类,下列荨麻疹属非免疫性的是()

A.蛋白胨性荨麻疹

B.皮肤划痕症

C.延迟性皮肤划痕症

D.延迟性压力性荨麻疹

E.血清病型荨麻疹

更多题库