问题 单项选择题 A1/A2型题

富含血小板血浆法制备的血小板,第一次轻离心时,大约有____和____残留在红细胞中()

A.20%的白细胞和20%~30%的血小板

B.20%~30%的血浆和20%~30%的血小板

C.20%的血浆和20%~30%的血小板

D.20%的血浆和20%~30%的白细胞

E.40%的血浆和10%~20%的血小板

答案

参考答案:C

解析:富含血小板血浆法,是将采集到多联袋内的全血经第一次轻离心后将富含血小板的血浆分入第2袋,首袋的红细胞与添加液混合。之后将富含血小板血浆进行第二次强离心,制成浓缩血小板和乏血小板血浆。该方法制备的血小板由于第一次是轻离心,大约20%的血浆和20%~30%的血小板残留在红细胞中。

单项选择题

A recent poll indicated that half the teenagers in the United States believe that communication between them and their parents is (1) and further that one of the prime causes of this gap is (2) listening behavior. As a(an) (3) in point, one parent believed that her daughter had a severe (4) problem. She was so (5) that she took her to an audiologist to have her ear tested. The audiologist carefully tested both ears and reported back to the parent:"There’s nothing wrong with her hearing. She’s just (6) you out. "

A leading cause of the (7) divorce rate (more than half of all marriages end in divorce) is the failure of husbands and wives to (8) effectively. They don’t listen to each other. Neither person (9) to the actual message sent by the other.

In (10) fashion, political scientists report that a growing number of people believe that their elected and (11) officials are out of (12) with the constituents they are supposedly (13) Why Because they don’t believe that they listen to them. In fact, it seems that sometimes our politicians don’t even listen to themselves. The following is a true story: At a national (14) conference held in Albuquerque some years ago, then Senator Joseph Montoya was (15) a copy of a press release by a press aide shortly before he got up before the audience to (16) a speech. When he rose to speak, (17) the horror of the press aide and the (18) of his audience, Montoya began reading the press release, not his speech. He began, "For immediate release. Senator Joseph M. Montoya, Democrat of New Mexico, last night told the National... " Montoya read the entire six page release, (19) with the statement that he "was repeatedly (20) by applause.

1()

A.scarce

B.little

C.rare

D.poor

选择题