非淹没丁坝和淹没丁坝的水流各有何特点？

* * 毛滴虫适宜的生长环境为（）.

A.pH值＞5

B.pH值5.5～6.0

C.pH值6.0～6.5

D.pH值6.5～7.5

E.pH值＞7.5

在世间一切事物中，“人是第一个可宝贵的。”人之可宝贵主要在于

A．人的价值具有工具性

B．人的价值是现实的

C．人能够创造价值

D．人的社会是“自由人联合体”

TCP/IP (71) layer protocols provide services to the application (72) running on a computer. The application layer does not define the application itself, but rather it defines
(73) that applications need — like the ability to transfer a file in the case of HTTP. In short, the application layer provides an (74) 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 (75) layer consists of two main protocol options — the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP).

A. hardware B. software C. packetD. equipment

矿物透光能力的大小称为（）

A.解离

B.挠性

C.弹性

D.透明度

E.延展性

采取税收保全措施、强制执行措施的权力，不得由法定的税务机关以外的单位和个人行使。