搜题请搜索小程序“爱下问搜题”
问题 单项选择题

以水泥净浆、砂浆或以混凝土作为基本体，以非连续的短纤维或连续不断的长纤维作为（）所组成的水泥复合材料称为纤维混凝土。

A.添加剂

B.混合材料

C.增加材料

D.外加剂

答案

参考答案：C

填空题

变异是指亲子间和子代个体间的______，变异首先决定于______物质的不同，其次与______也有关系．
查看答案
单项选择题

TCP/IP (1) layer protocols provide services to the application(2) running on a computer. The application layer does not define the application itself, but rather it defines  (3) that applications need-like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (4) between software running on a computer and the network itself. The TCP/IP application layer includes a relatively large number of protocols, with HTTP being only one of those. The TCP/IP  (5) layer consists of two main protocol options-the Transmission Control Protocol (TCP) And the User Datagram Protocol (UDP).

空白（4）处应选择（）

A.iteration

B.object

C.interface

D.activity
查看答案