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What do we know about modern bows
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Passage Four Is there enough oil beneath the Arctic National Wildlife Refuge (ANWR)to help secure America’s energy future President Bush certainly thinks so. He has argued that tapping ANWR’s oil would help ease California’s electricity crisis and provide a major boost to the country’s energy independence. But no one knows for sure how much crude oil lies buried beneath the frozen earth, with the last government survey, conducted in 1998, projecting output anywhere from 3 billion to 16 billion barrels. The oil industry goes with the high end of the range, which could equal as much as 10% of U.S. consumption for as long as six years. By pumping more than 1 million barrels a day from the reserve for the next two to three decades, lobbyists claim, the nation could cut back on imports equivalent to all shipments to the U.S. from Saudi Arabia. Sounds good. An oil boom would also mean a multibillion-dollar windfall(意外之才) in tax revenues, royalties (开采权使用费)and leasing fees for Alaska and the Federal Government. Best of all, advocates of drilling say, damage to the environment would be insignificant. "We’ve never had a documented case of an oil rig chasing deer out onto the pack ice," says Alaska State Representative Scott Ogan. Not so fast, say environmentalists. Sticking to the low end of government estimates, the National Resources Defense Council says there may be no more than 3.2 billion barrels of economically recoverable oil in the coastal plain of ANWR, a drop in the bucket that would do virtually nothing to ease America’s energy problems. And consumers would wait up to a decade to gain any benefits, because drilling could begin only after much bargaining over leases, environmental permits and regulatory review. As for ANWR’s impact on the California power crisis, environmentalists point out that oil is responsible for only 1% of the Golden State’s electricity output—and just 3% of the nation’s. Which of the following is NOT TURE according to the passage
【说明】 代码实例中的服务器通过socket连接向客户端发送字符串"Hello，you are connected!"。只要在服务器上运行该服务器软件，在客户端运行客户软件，客户端就会收到该字符串。 客户端程序代码如下： #include＜stdio.h＞ #include＜stdlib.h＞ #include＜errno.h＞ #include＜string.h＞ #include＜netdb.h＞ #include＜sys/types.h＞ #include＜netinet/in.h＞ #include＜sys/socket.h＞ #define SERVPORT 3333 #define MAXDATASIZE 100 /*每次最大数据传输量*/ main(int argc, char*argv[]){ int sockfd, recvbytes; char buf[MAXDATASIZE]; stmct hostent*host; struct sockaddr_in serv_addr; if (1) { fprintf(stderr, "Please enter the server’s hostname!\n"); exit(1); } if＜(host=gethostbyname(argv[1]))=NULL) { herror("gethostbyname出错!"); exit(1); } if ((sockfd = socket(AF_INET, (2), 0))=-1) { perror("socket创建出错!"); exit(1); } serv_addr.sin_family=AF_INET; serv_addr.sin_port=htons(SERVPORT); Serv_addr.sin_addr=*((structin_addr*)host→h_addr); bzero(&(serv_addr.sin_zero), 8); if(connect (3), (struct sockaddr *)&serv_addr, sizeof(struct sockaddr))=-1) { perror("connect出错!"); exit(1); } if((recvbytes=recv (4), buf, MAXDATASIZE, 0))=-1) { perror("recv出错!"); exit(1); } buf[recvbytes]=’\0’; pfintf("Received: %s", buf); close(sockfd); }
阅读以下说明，回答下面问题。 【说明】 二层隧道协议L2TP(1ayer 2 Tunneling Protocol)是一种基于点对点协议PPP的二层隧道协议。某网络结构如图3.3所示，采用L2TP来实现网络安全。 【问题2】 某路由器的部分配置信息如下所示，请解释其中标有下划线部分的含义。 …… ! username sp_lac password 7 104D000A0618 username Bob password 7 060506324P41 ! vpdn enable //第(1)处 ! vpdn -group 1 //第(2)处 accept dialin 12tp virtual-template 1 remote sp_lac //第(3)处 local name Bob //第(4)处 ! lcp renegotiation always //第(5)处 ! no 12tp tunnel authentication //第(6)处
区域城镇关系示意图：图纸比例为1:200000～1:1000000，标明相邻城镇位置、行政区划、重要交通设施、重要工矿和风景名胜区。( )
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