在我国西部大开发的战略中,“保护天然林”和“退耕还林”是两项重要内容,采取这项措施的首要目标是()
A.开展生态旅游
B.发展畜牧业
C.增加木材产量
D.改善生态环境
参考答案:D
近代中国面临着严重的民族危机,无数仁人志士都在探索救国救民的出路,下列有关中国人“向西方学习”历程先后顺序表述正确的是: [ ]
A.学技术——学制度——学思想
B.学制度——学思想——学技术
C.学思想——学制度——学技术
D.学技术——学思想——学制度
(41) is a protocol that a host uses to inform a router when it joins or leaves an Internet multicast group. (42) is an error detection code that most data communication networks use. (43) is an interior gateway protocol that uses a distance vector algorithm to propagate routing information. (44) is a transfer mode in which all types of information are organized into fixed form cells on an asynchronous or non-periodic basis over a range of media. (45) is an identifier of a web page.
A.HTTP
B.URL
C.HTML
D.TAG