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问题 单项选择题

有关流行性腮腺炎的描述，不正确的是

A．唾液淀粉酶经淋巴人血，由尿排出

B．为副黏液病毒感染

C．导管上皮水肿，管腔内充满坏死细胞和渗出物

D．腺体被膜可间质水肿，充血，中性粒细胞，淋巴细胞浸润

E．为非化脓性感染

答案

参考答案：D

单项选择题

A transport layer protocol has several responsibilities, One is to create a process-to-process (program-to-program) communication; TCP uses port （1） to accomplish this. Anotherresponsibility of a transport layer protocol is to create a（2）and error-control mechanism atthe transport level. TCP uses a sliding（3）protocol to achieve flow control. It uses theacknowledgment packet, time-out, and retransmission to achieve （4） control. The transportlayer is also responsible for providing a connection mechanism for the application program. Theapplication program sends （5）of data to the transport layer. It is the responsibility of thetransport layer at the sending station to make a connection with the receiver.

（3）是（）

A.path

B.window

C.frame

D.diagram
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单项选择题

目前船用柴油润滑系统中，能有效地将油中的金属微粒进行分离的滤器是（）。

A.磁性滤器

B.离心式滤器

C.毛巾式滤器

D.缝隙滤器
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