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当客户端请求域名解析时，如果本地DNS服务器不能完成解析，就把请求发送给其他服务器，依次进行查询，直到把域名解析结果返回给请求的客户端，这种方式叫______。
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In order to work here the foreigner needs a work permit, which must be applied 1 by his prospective employer. The problem here is that the Department of the Employment has the right to 2 or refuse these permits, and there is little that can be 3 about it. It would be extremely unwise 4 a foreign visitor to work without a permit, since anyone doing so is 5 to immediate deportation. There are some 6 to this rule, most notably people from the Common Market countries, who are 7 to work without permits, and who are often given 8 residence permits of up to five years. Some 9 people, such as doctors, foreign journalists, 10 and others, can work without permits.The problem with the Act is not just that some of its rules are unfair but 11 it is administered, and the people who administer it.An immigration official has the power to stop a visitor 12 these shores coming into the country. If this happens the visitor has the 13 to appeal 14 the Immigration Appeal Tribunal. While the appeals are being considered, the visitor has no 15 but to wait sometimes for quite a long time.Critics of the law say that immigration officials treat the 16 visitors badly, and appear to accept or 17 them for no 18 reason. Which side of the political 19 you are on, there seems to be an urgent need for a good look at the Act, for it causes frequent argument, and in the eyes of many, real 20 . 14（）
In order to work here the foreigner needs a work permit, which must be applied 1 by his prospective employer. The problem here is that the Department of the Employment has the right to 2 or refuse these permits, and there is little that can be 3 about it. It would be extremely unwise 4 a foreign visitor to work without a permit, since anyone doing so is 5 to immediate deportation. There are some 6 to this rule, most notably people from the Common Market countries, who are 7 to work without permits, and who are often given 8 residence permits of up to five years. Some 9 people, such as doctors, foreign journalists, 10 and others, can work without permits.The problem with the Act is not just that some of its rules are unfair but 11 it is administered, and the people who administer it.An immigration official has the power to stop a visitor 12 these shores coming into the country. If this happens the visitor has the 13 to appeal 14 the Immigration Appeal Tribunal. While the appeals are being considered, the visitor has no 15 but to wait sometimes for quite a long time.Critics of the law say that immigration officials treat the 16 visitors badly, and appear to accept or 17 them for no 18 reason. Which side of the political 19 you are on, there seems to be an urgent need for a good look at the Act, for it causes frequent argument, and in the eyes of many, real 20 . 19（）
考虑某路由器具有下列路由表项(见表1)。 表1 网络前缀 下一跳 142.150.64.0/24 A 142.150.71.128/28 B 142.150.71.128/30 C 142.150.0.0/16 D 将142.150.64.0/24划分为4个规模尽可能大的等长子网，给出子网掩码及每个子网的可分配地址范围。
下列关于FTP协议的描述，______是不正确的。
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