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卵巢表面上皮肿瘤主要分哪几类（至少列出6类）？

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回答以下问题。若设置域名解析服务器，已知该文件服务器上文件named.boot的内容如下： Directory/var/named Cachenamed.root Primary 0.0.127 in-addr.arpanamed.local Primary net.edu.cnnet.edu.cn.hosts Primary 58.112.202.in-addr.arpanet.edu.cn.rev Secondary edu.cn 202.112.0.33edu.cn.2nd Forward 202.112.0.35 【问题3】当DNS服务器启动后，如何验证其是否工作正常

Directions: This section is designed to test your ability to understand spoken English. You will hear a selection of recorded materials and you must answer the questions that accompany them. There are two parts in this section, Part A and Part B. Remember, while you are doing the test, you should first put down your answers in your test booklet. At the end of the listening comprehension section, you will have 3 minutes to transfer your answers from your test booklet onto your ANSWER SHEET 1. If you have any questions, you may raise your hand. Now as you will not be allowed to speak once the test is started. Now look at Part A in your test booklet.Part A You will hear 10 short dialogues. For each dialogue, there is one question and four possible answers. Choose the correct answer--A, B, C or D, and mark it in your test booklet. You will have 15 seconds to answer the question and you will hear each dialogue ONLY ONCE. Now look at question 1 Where is the conversation

At a department store.
B. At a hotel.
C. At a cinema.
D. At a bookstore.

算术平均数又称平均值、均值，是全部变量值的算术平均，有简单算术平均数和加权算术平均数两种。( )

A. 对
B. 错

李先生于2007年1月采用分期付款方式购买了一套商品房，他根据房产分户图选择了一套两居室，并向商业银行申请了50万元抵押贷款，分10年按月等额还款。房子买好后，李先生对房子进行了装修，拆除了餐厅与厨房之间的非承重墙，增大了厨房的空间。李先生为单身，搬入新居后想将另外一间租出去。2008年4月，小王向李先生租房，并签订了租住合同。小王搬进来居住后的一天，不小心将李先生家摆设的古董花瓶打碎。古董花瓶是李先生一周前花4万元从拍卖行买回来的。虽然他为了这个花瓶购买了保险，但保险公司说这属于人为破坏不予受理。李先生只好将保险公司告上法庭。试根据以上情况，回答下列问题。李先生选房时参照的房产分户图，比例尺一般为( )。

A. 1:100
B. 1:200
C. 1:500
D. 1:1000