直流电动机的额定功率是指( )。A．输出的电压 B．输出的电流 C．输出的机械功率

任务型阅读。

                                                 Should kids do chores?

     People find that children as young as 18 months can help with chores When parents say to those

children, "Just look at the paper," they will pick it up.

     Some parents think childhood is just for playing, so they don't ask their children to do chores. Other

parents say, "I know it's wrong, but it's quicker to do it by myself !" But most parents believe that chores

are a way of teaching kids responsibility (责任). Children learn to help, share and care about others by

doing chores. Things like taking care of a pet or a baby and helping make meals are some examples (例子) of helping others.

     Reasons for doing chores;

     ★To learn responsibility: Most people believe that doing chores is good for kids.

     ★To share the workload: Kids that help clean won't make a big mess.

     ★To learn skills: Kids will learn how to cook, clean and do other things in the house.

     There are  benefits (益处) and challenges (挑战) when doing chores, so start to help your parents

with the chores. You will learn a lot by doing them.

根据短文内容，完成下列各题。

1. People find that children as _____ as 18 months can help with _____.

2. Some parents think childhood is just for _____. 

3. Other parents know that chores are a way of teaching kids _____.

4. Reasons for doing chores:

    (1) To learn the responsibility.

    (2) To share the workload.

    (3) _____ _____ _____.

5. There are _____ and _____ when you do the chores, so start to help your parents with the chores.

现有一瓶质量分数为20%的某溶液，倒出体积后再加水，直到所得溶液质量和原来溶液的质量相等，又倒出体积，最后剩下溶液中溶质的质量分数为 [ ]

A、3%

B、4%

C、5%

D、6%

The ABC Bank Irrevocable documentary credit Number: LC123-258866 Date: August 24,1999 Date and place of expiry : October 30, 1999 China Advising bank: Bank of China Beneficiary: China XYZ import and export corp. Applicant: UVW corporation. Amount: USD52,500 (Say U.S Dollars fifty two thousand five hundred only) We hereby issue irrevocable documentary credit which is available with: Any bank By negotiation of beneficiary’s drafts at sight For full invoice value Drawn on the ABC bank Partial shipments: Not allowed Transshipment: Not allowed Shipment from: Shanghai To: Tokyo Japan At the latest: October 15, 1999 Following documents required: +Signed commercial invoice in three copies +Full set of clean on board ocean bill of lading +Weight certificate in two copies Covering: 100 metric tons (5PCT MOL) of XY chemical in drums at USD 500 per M/T. Special instructions: Insurance to be effected by buyer. Instructions to advising bank: Please advise this credit to the beneficiary We hereby undertake that drawers, endorsers in compliance with the terms of this credit will be duly honored upon presentation to the drawee bank. Authorized signature 一、根据上述信用证，回答下列问题

信用证的种类

杭州的皇家园林遗址主要分布在（）。

A、柳浪闻莺

B、孤山

C、凤凰山

D、刘庄

E、郭庄

设计概算的编制原则是什么？