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问题 单项选择题

下列关于红细胞比容的说法中，不正确的是

A．与红细胞数量有关

B．与红细胞大小有关

C．是抗凝血自然沉降后所测得的红细胞在全血中所占体积的百分比

D．在各种贫血时红细胞比容会降低

E．大面积烧伤病人的红细胞比容常增高

答案

参考答案：C

单项选择题

普通混凝土的抗压强度测定，若采用10cm正立方体试件，则试验结果应乘以换算系数

A.0.9  

B.0.95  

C.1.05  

D.1.85
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单项选择题

A transport layer protocol usually has several responsibilities．One is to create a process-to-process communication；UDP uses (71) numbers to accomplish this．Another responsibility is to providecontrol mechanisms at the transport level．UDP does this task at a very minimal level．There is no flowcontrol mechanism and there is no (72) for received packet．UDP, however,does provide errorcontrol to some extent．If UDP detects an error in the received packet，it will silently drop it．
The transport layer also provides a connection mechanism for the processes．The (73) must be able to send streams of data to the transport layer．It is the responsibility of the transport layer at (74) station to make the connection with the receiver,chop the stream into transportable units，numberthem，and send them one by one．It is the responsibility of the transport layer at the receiving end to waituntil all the different units belonging to the same process have arrived，check and pass those that are (75) flee，and deliver them to the receiving process as a stream．

A．call

B．state

C．cost

D．error
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