利用如图所示的实验器材,测额定电压为2.5V的小灯泡的电阻. (1)如图1,用

题型:问答题

问题:

利用如图所示的实验器材,测额定电压为2.5V的小灯泡的电阻.

(1)如图1,用笔画线做导线,将题中实物图按电路图连线.

(2)小明同学闭合开关,调节变阻器的滑片到某位置时,电压表和电流表的指示如图2所示,请把电流表和电压表的示数填在下列表格中,并计算小灯泡此时的电阻(请将计算结果填入表格中).从表格中可知灯的电阻是变化的,因为灯丝的电阻受到了______的影响.

实验次数电压表示数/V电流表示数/A电阻亮度
1偏暗
22.50.38.33正常
330.348.82偏亮
(3)若实验中所用器材良好,但某同学在实验中发现电流表的指针几乎不动,而电压表的示数较大,则电路中发生故障的原因可能是______.

考点:伏安法测电阻
题型:问答题

男,19岁,头痛3个月,CT示鞍区实性病灶,关于影像学分析,下列哪些是正确的()

A.位于鞍上应首先考虑颅咽管瘤

B.位于鞍上偏前,有明显强化,无钙化应首先考虑脑膜瘤

C.无钙化可除外颅咽管瘤

D.位于鞍旁并明显强化,应考虑动脉瘤的可能

E.位于鞍旁并灶周水肿,无胶质瘤可能

题型:问答题
We experienced and unusual weekend last month!
Early in the morning, we went to the country and spent a whole day           wild flowers.         the car full of             we were going home. On our way back, my wife          a bookshelf outside a furniture shop. “Buy it,” my wife said at once. “We’ll            it home on the roof-rack(车顶架). I’ve always wanted one like that.”
Ten minutes          , we were back with the bookshelf in the flowers on the roof.
In the gathering darkness I drove         . Other drivers seemed unusually          that evening. The            even stopped traffic to let us through. I had thought carrying furniture was a good idea.
After a time my wife said, “ There’s a long line of cars         . Why don’t they overtake(超车), I wonder?” Just at that time a police car did         . The two officers inside looked at us seriously          they passed. But then, with a kind smile they asked us to          their car through the busy traffic. The police car stopped at our village church. One of the            came to me.
“Right, sir,” he said, “Do you need any more help?”
I was a bit         . “Thanks, officer,” I said. “You have been very kind.”
He was staring at our car, first at the flowers, then at the bookshelf. “Well, well,” he said,         . “It’s a bookshelf you’ve got there! We thought it was something else.”
My wife began to laugh. Suddenly I understood          the police drove here. The truth            me. I smiled at the officer, “Yes, it’s a bookshelf,           thanks again.” Then I            home as fast as I could.
小题1:
A.growingB.pickingC.buyingD.selling
小题2:
A.ForB.AsC.WithoutD.With
小题3:
A.booksB.flowersC.fruitsD.vegetables
小题4:
A.noticedB.heardC.watchedD.felt
小题5:
A.postB.carryC.sendD.hold
小题6:
A.beforeB.afterC.laterD.ago
小题7:
A.quicklyB.quietlyC.carelesslyD.slowly
小题8:
A.politeB.worriedC.rudeD.frightened
小题9:
A.driversB.policeC.cleanersD.villagers
小题10:
A.behindB.aheadC.besideD.along
小题11:
A.goB.stopC.overtakeD.arrive
小题12:
A.whileB.afterC.asD.before
小题13:
A.takeB.followC.moveD.push
小题14:
A.officersB.passers-byC.driversD.ministers
小题15:
A.puzzledB.excitedC.depressedD.delighted
小题16:
A.coughingB.laughingC.cryingD.shouting
小题17:
A.howB.whatC.whoD.why
小题18:
A.pleasedB.fooledC.interestedD.hit
小题19:
A.so B.butC.andD.or
小题20:
A.droveB.walkedC.flewD.left
题型:问答题

主司下肢运动的经脉是()

A.冲脉

B.任脉

C.督脉

D.阴维脉和阳维脉

E.阴跷脉和阳跷脉

题型:问答题

下列编码方法中,具有可变分辨率和区域性质的是:()。

A.链码

B.四叉树编码

C.游程编码

D.直接栅格编码

题型:问答题

提示组织已发生不可逆性坏死的是

A.局部皮肤发绀
B.局部皮温降低
C.局部缺血,远侧浅感觉丧失
D.手指重压皮肤,放开后肤色缓慢复原
E.发绀区指压后不出现色泽改变

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