与CD4或CD8分子胞内段尾部相连的ptk是()。A.P56lck B.P59fyn

题型:单项选择题

问题:

与CD4或CD8分子胞内段尾部相连的ptk是()。

A.P56lck

B.P59fyn

C.ZAP-70

D.上列A和B两项

E.上列A、B和C三项

考点:医学免疫学医学免疫学题库
题型:单项选择题

如图甲所示,一质量为m=1.0kg的木块从倾角为α=37°、长度为L=3.2m的固定粗糙斜面顶端由静止开始运动,同时木块受水平向左的风力作用,且水平风力与风速成正比,木块在斜面上下滑时的加速度a与风速v之间的关系如图乙所示.已知sin 37°=0.6,cos 37°=0.8,取重力加速度大小为g=10m/s2,请求

(1)木块与斜面间的动摩擦因数

(2)风速v=3.0m/s时木块沿斜面下滑的时间t及木块所受水平风力F的大小.

题型:单项选择题

女性,34岁,头痛、乏力、感觉异常和视物模糊反复发作,记忆力减退。经激素治疗好转。

此病诊断征象和依据包括哪些()

 

A.脑深部白质有多发性长T1长T2病灶

B.病灶主要分布于脑室周围

C.Gd-DTPA增强扫描见部分病灶有强化表现

D.经激素治疗好转

E.活动期病灶明显强化

题型:单项选择题
It was on a warm day last summer. I was walking by the sea. The waves came and went. But I didn’t see them. I was lost in my thoughts.
A row of small holes soon caught my eyes. They lay in the sandy earth by the side of a road. In a minute I would have stepped on them.
What are these holes? I wondered. It had an answer soon. A fat, hairy insect crawled up from the earth. It had a wide tail. It was using the tail to dig in the ground.
The insect moved round and round in one spot(地点). Soon it had made another hole. When it was finished, the insect hid at the bottom. It covered its head with sand.
By now my thoughts of the early morning had gone. This new hole and the insect were all my world. So I sat quite still by the side of the road. And I waited.
As I watched, a small ant crossed the road. It passed my foot, and then it crossed the sandy earth. In a little while it reached the edge of the hole. I saw it start to fall in. The ant tried to turn back. But it couldn’t.
And then I knew. I knew why the holes were there. For just then the fat insect came up out of the hole. It ate the ant who was trapped there.
Later I learned the insect’s name. It’s called ant lion. It digs holes to catch ants.
I’ll never forget that day. The holes looked so small to me. But to the ant and the ant lion they were the whole world.
I took my walks by the sea that summer. But I never again learned as much as I did on the one.
小题1: What did the ant lion use to dig holes?
A.Its tailB.Its feet.C.Its headD.Its whole body
小题2: Why did the ant lion hide in the hole?
A.To keep the sun awayB.So no one would catch it.
C.So the ant wouldn’t see itD.To keep warm.
小题3: Why did “I” sit down by the side of the road?
A.To thinkB.To eat her lunch
C.To watch the little holesD.To catch ants.
小题4:Why did the ant lion dig the holes?
A.To play a gameB.To catch its food
C.To hide its eggsD.To hide from its enemy
小题5:Why did “I” never forget that day?
A.Learned somethingB.Had a nice time
C.Saw the ant lion whenever she took a walk
D.Felt sorry for the ant.
题型:单项选择题

物权的法律特征包括______。

A.物权是绝对权

B.物权属于支配权

C.物权是法定的,物权的设定采用法定主义

D.物权只具有追及效力

E.物权的客体一般为物

题型:单项选择题

1999年9月2日,A市市民江某与本市个体户赵某签订厂房屋租赁合同。双方约定,江某将其自有房屋三间租给赵某以开办饭馆,租赁期为2年,自1999年9月2日至2001年 9月2日;每月由承租人赵某向江某交纳租金3000元,必须在每月1至3日交纳,超过规定期限不交,江某有权收回房屋使用权;在租赁期间,房屋的修缮费由承租人承担;所租房屋只准承租人使用,不许转租;此合同自签订之日起生效,如一方违约,违约方要付给对方违约金5000元。合同签订后,江某即将房屋钥匙交给赵某,赵某同时也向江某交纳了第一个月的房租3000元。1999年10月2日,江某通知赵某准备把该租赁房屋转让给张某,赵某表示同意。次日,江某与张某办理了房地产登记过户手续。10月6日,赵某将该房转租给其友王某,并每月收取租金4000元。张某得知此情况后,便找赵某交涉,要求赵某解除其与王某的租赁关系。赵某以其房屋是自江某处租赁为由,置之不理。张某即诉至法院,要求收回房屋,并要求赵某承担违约责任。
要求:根据上述材料,回答下列问题:
(1)赵某的转租行为是否有效是否违约
(2)张某是否有权要求赵某向其承担违约责任张某能否收回房屋
(3)赵某的理由是否成立为什么

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