问题 单项选择题

对于组织固定后的脱水,下面的描述不正确的是()

A.脱水是借某些溶媒置换组织内水分的过程

B.脱水剂必须能与水以任意比例混合

C.根据固定剂的要求选择脱水剂

D.根据被固定组织的要求选择脱水剂

E.乙醇是最常用的脱水剂

答案

参考答案:D

解析:组织经固定和水洗后含大量水分,而水和石蜡不能混合,因此在浸蜡和包埋前必须进行脱水。脱水是借某些溶媒置换组织内水分的过程,脱水剂必须能与水以任意比例混合,至于选用何种脱水剂,应根据固定剂的要求选择,而不是根据被固定组织的要求选择。乙醇是最常用的脱水剂。

单项选择题
填空题

We already live in an ever-communicated world that will only become mere so in the next tech era. We’ve (1) that gets us so much information. We’ve got every second (2) , we’ve get computers and laptops, we’ve get personal organizers and we’re just being (3) and every advance in technology seems to create more and more communications at us. We are sort of (4) .
Research suggests that all the multi-tasking may actually make our brains (5) , producing a world-wide increase in IQ (6) and mere in recent decades. Is there any real benefit in (7) we new have to go through
We’re net becoming a race of (8) , but many de think certain skills are enhanced and certain are net. You knew the ability to (9) , to answer a dozen e- mails in five minutes, or to fill out (10) . That’s enhanced. But when someone is out there with his kids (11) or something like that, he’s got his cell phone in his pocket. He’s always wondering, "Gee, did I get a voicemail " This might have negative effects (12) .
Creativity is something that happens slowly. It happens when your brain is just (13) , just playing, when it (14) which you hadn’t thought of, or maybe you have time to read a book. You are a businessperson but you have time to (15) ,or about a philosopher and something that happened long age or something or some idea (16) . Actually, it might occur to you that you (17) in that way, and so it’s this mixture of unrelated ideas that feeds your productivity, (18) . And if your mind is disciplined to answer every e-mail, then you don’t have time for that playful noodling. You don’t have time for (19) . So I think maybe we’re getting smarter in .some senses, but ever-communication is (20) and to our reflection.

We already live in an ever-communicated world that will only become mere so in the next tech era. We’ve (1) that gets us so much information. We’ve got every second (2) , we’ve get computers and laptops, we’ve get personal organizers and we’re just being (3) and every advance in technology seems to create more and more communications at us. We are sort of (4) .
Research suggests that all the multi-tasking may actually make our brains (5) , producing a world-wide increase in IQ (6) and mere in recent decades. Is there any real benefit in (7) we new have to go through
We’re net becoming a race of (8) , but many de think certain skills are enhanced and certain are net. You knew the ability to (9) , to answer a dozen e- mails in five minutes, or to fill out (10) . That’s enhanced. But when someone is out there with his kids (11) or something like that, he’s got his cell phone in his pocket. He’s always wondering, "Gee, did I get a voicemail " This might have negative effects (12) .
Creativity is something that happens slowly. It happens when your brain is just (13) , just playing, when it (14) which you hadn’t thought of, or maybe you have time to read a book. You are a businessperson but you have time to (15) ,or about a philosopher and something that happened long age or something or some idea (16) . Actually, it might occur to you that you (17) in that way, and so it’s this mixture of unrelated ideas that feeds your productivity, (18) . And if your mind is disciplined to answer every e-mail, then you don’t have time for that playful noodling. You don’t have time for (19) . So I think maybe we’re getting smarter in .some senses, but ever-communication is (20) and to our reflection.