异体器官移植手术往往很难成功,最大的障碍就是异体细胞间的排斥,这主要是由于细胞膜

题型:选择题

问题:

异体器官移植手术往往很难成功,最大的障碍就是异体细胞间的排斥,这主要是由于细胞膜具有识别作用,这种生理功能的结构基础是[ ]

A.细胞膜由磷脂分子和蛋白质分子构成

B.细胞膜的外表面有糖蛋白

C.细胞膜具有一定的流动性

D.细胞膜具有选择透过性

考点:细胞膜的功能
题型:选择题

As any diplomat from Britain, Austria or Turkey can tell you, handling the legacy of a vanished, far-flung empire is a tricky business. But for Georgia, the gap between old glory and present vulnerability is especially wide.

Today’s Georgia is diminished by war, buffeted by geopolitics and recovering from post-Soviet chaos. But 800 years ago the country was a mighty military, cultural and ecclesiastical force. Its greatest monarch, Queen Tamara, defeated many foes (including her first husband) and built fine monuments. In her time, Georgia also had a big stake in the Christian life of the Holy Land. From Jerusalem to the Balkans, Georgia’s priests, artists and church-builders were active and respected. So too were its poets, like Shota Rustaveli, the national bard who dedicated an epic to his beloved queen.

In between seeking western aid and coping with power cuts, modern Georgia has pledged to keep a wary eye on every place where churches, inscriptions and frescoes testify to its golden age. That includes Greece, Turkey, Bulgaria, Romania and above all, Israel. Last year, Georgians were enraged when a fresco of Rustaveli, in a Jerusalem church under the care of the Greek Orthodox Patriarchate, was defaced, then badly restored. This year, a better restoration was done, but Georgians now want a promise that in all future restoration their own experts can take part. They also want to stop the seepage of Georgian frescoes and icons, supposedly under the Patriarchate’s care, on to the art market. Several times, Georgia has had to use its meagre resources to buy back pieces of the national heritage. The hope is that things will improve with the recent election of a new Jerusalem Patriarch, after his predecessor was ousted under a cloud of scandal.

Georgia’s ties with Israel are good, thanks to a thriving Georgian-Jewish community with happy memories of its homeland. Georgia also gets along with Greece, amid a fug of sentimentality over legends about the Argonauts that link the two nations. But can these warm, fuzzy feelings translate into better protection for an ancient culture That will be a challenge for Geld Bezhuashvili, who succeeds Salome Zourabichvili, the French-born diplomat who was sacked, after a power struggle, as Georgian foreign minister on October 19th.

Romania is mentioned in the text to ()

A. illustrate a fresco of Rustaveli

B. demonstrate the western aid Georgia obtained

C. indicate Georgia’s golden age

D.specify the scope of Georgia’s lookout

题型:选择题

(1)如图所示是一种常用的动圈式话筒,当 你对着话筒说话时,声音使与膜片相连的线圈振 动.线圈在磁场中的这种振动,能产生随着声音变化而变化的___________,这是_____________现象.      

(2)随着社会的发展,无线电广播、电视、手机等都已逐步进入了寻常百姓家,它们都是靠接收 _________________________工作的.

题型:选择题

点P(-2,1)关于x轴对称的点的坐标是(  )

A.(-2,-1)

B.(2,-1)

C.(2,1)

D.(1,-2)

题型:选择题

为了使新、旧管子中心在一条直线上,管头应对正用()检验管段对正情况,校正后,即可施焊,焊条要按管子材料选用。

A、直尺测量法

B、塞尺测量法

C、卡尺测量法

D、透光法

题型:选择题

FTTH蝶形光缆布线,根据实际情况,室外布线可分为架空敷设方式、()和波纹管方式三种。

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