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问题 单项选择题

诊断心肌梗死，最特异的生化标志物是

A．CK
B．AST
C．LD
D．肌红蛋白
E．心肌肌钙蛋白

答案

参考答案：E

解析：由于cTnT和cTnI与骨骼肌中的异质体分别由不同基因编码，具不同的氨基酸顺序，有独特的抗原性，故它们的特异性要明显优越。

问答题

One of the really nice features about e-mails is that they allow us to send files as attachments to other users. This is a very good thing. If I’m working with a colleague and want to send him an image file or a word file, I can do so very quickly and easily, without having to fax it to him. This saves on long distance bills and printing costs. It also, however, presents a problem, because attachments can take a long time to download. For those of us who pay by the hour for Internet service, unwanted attachments can be quite costly and time-consuming. I once had someone send me fifteen large image files, and it tied up my computer for 20 minutes just to download one of them. So, in short, if you’re going to send an attachment, get permission first.
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单项选择题

该病潜伏期一般为

A．1周

B．2周

C．3周

D．4周

E．5周
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