国家发改委能源局表示,按照节能、环保、经济的原则,应优先调度可再生、高效、清洁的

题型:问答题

问题:

国家发改委能源局表示,按照节能、环保、经济的原则,应优先调度可再生、高效、清洁的机组发电,限制能耗高、污染重的小火电机组发电,但西部小型水力发电站是国家扶持之列。已知某小型水力发电站的发电机有稳定的输出电压。它发出的电先通过电站附近的升压变压器升压,然后通过输电线路把电能输送到远处用户附近的降压变压器,经降低电压后再输送至各用户。设变压器都是理想的,那么在用电高峰期,随用电器电功率的增加将导致(  )

A.发电机的输出电流变小

B.高压输电线路的功率损失变大

C.升压变压器次级线圈两端的电压变小

D.升压变压器次级线圈两端的电压变大

考点:正弦式交变电流
题型:问答题

阅读理解。

     People celebrate birthdays in almost every country on earth. And they celebrate them in many

different ways.

     In China and in Japan, for example, the arrival of New Year is more important than a person's

birthday. So everyone adds a year to celebrate their ages on New Year's Day, instead of on their

birthdays,

     In Brazil, the special birthday food isn't cake, but special candles. In China, it's long noodles-for

long life. In Iceland, people have pancakes with candies rolled inside them on birthdays.

     In Britain, a birthday is an all-day celebration. At school, the birthday child is lifted up and "bumped"

by his classmates. This means the child is lifted by the feet and arms and bumped to the ground, once for

each year once for good growth. In Israel, the same custom is followed, except the birthday person is

lifted and lowered while sitting in a chair.

     In Holland, children not only get presents, but also give things out. They give cakes, cookies and

candles to their classmates and teachers on their birthdays.

     In Mexico, it's good luck to give birthday greetings as early in the day as possible. So it's usual for the

birthday child to be woken up at midnight by fiends singing birthday songs.

In India, birthday celebrations also begin before dawn. Prayers and blessings must be said before morning comes.

     In Thailand, two tall candles are lighted the night before the birthday. One is as tall as the birthday

person. If it goes out early, it's bad luck. Another customs of Thailand is that they buy live fish and birds

for the birthday person and then the birthday person frees the animals, and it brings good luck.

     In Nigeria, people in a certain age group celebrate their birthdays together, on a certain day.

     In many countries birthday customs are changing. Old customs are giving way to western style of

birthdays, with candletopped cakes. But one thing never changes-birthdays are special days for everyone!

1. It's a custom to lift and lower the birthday person in a chair in _____.

A. Britain

B. Israel

C. Britain and Israel

D. Israel and Thailand

2. According to the passage, which of the following is TRUE?

A. In Thailand people give fish and birds to the birthday person as presents.

B. In Holland people give presents to unbirthday persons on their birthdays.

C. In Nigeria people who were born in the same period may celebrate their birthdays on the same day.

D. In Thailand a candle will be lighted on the birthday night.

3. What does the text mainly talk about?

A. Different countries have different birthdays.

B. Celebrating birthdays is exciting.

C. Different ways of celebrating the birthday in different countries.

D. Everyone likes celebrating his or her birthday.

题型:问答题

船舶的长宽比对()影响最显著。

A.稳性

B.抗沉性

C.操纵性

D.快速性

题型:问答题

投资连接保险的缴费机制有两种,其中一种方式是在固定缴费基础上增加一个特殊规定,即()

A.保险费附加

B.保险费限额

C.保险费假期

D.保险费扣除

题型:问答题

理想的资源环境管理体制应符合哪些原则和要求?

题型:问答题

什么叫绿色照明工程?

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