(2x3y5-3a2b4)(-2x3y5-3a2b4)

题型:解答题

问题:

(2x3y5-3a2b4)(-2x3y5-3a2b4

考点:平方差公式
题型:解答题

据地质学家估计,北冰洋海底储藏着全球四分之一未勘探的石油和天然气,很可能是个“大油库”。近年俄、美、加等国纷纷在北极采取了一系列行动,北极形势骤然紧张。读地球极地投影图,回答题。

小题1:甲乙丙丁四海峡(或运河)中,位于板块生长边界的是(  )

A.甲

B.乙

C.丙

D.丁小题2:关于丙、戊两运河的叙述正确的是    (  )

①都是两大洲的分界线         ②都在同一国境内

③两端都直接连接大洋         ④都是石油的重要运输通道

A.①②

B.②③

C.③④

D.①④

题型:解答题

Do you like to eat out? Do you like to eat quickly? Do you like inexpensive food? Some people go to fast-food restaurants for these reasons. In the past, people usually went to diners(小餐馆)for these reasons. In fact, many people in the States still go to diners today for the same reasons.

A man named Walter Scott had the first “diner” in 1872. It wasn’t a real diner. It was only a food cart. People on the street walked up to the cart to buy food. These carts served late-night workers who wanted a cup of coffee and a late-night meal. The meal was a sandwich or boiled eggs. In 1887, Samuel Jones built the first diner big enough to allow the customers to come inside. However, they did not sit down. Later, people built diners with counters and stools, and people sat down while they ate.

Before long, many diners stayed open around the clock. In other words, people were able to eat in diner at any time. Diners changed in other ways, too. The original menu of sandwiches and coffee became bigger. It included soup, favorite dishes, and a breakfast menu. In addition, diners soon became permanent buildings. They were no longer carts on wheels.

Diners today look similar to  the diners of the early 1900s. They are usually buildings with large windows. Inside, the diners have shining counters with stools, booths, and tables and chairs. People can eat all three meals in a modern diner.

Today, many people eat in fast-food restaurants such as McDonald’s and Burger King. However, the diner remains an American tradition, and thousands of people still enjoy eating there. It was popular a century ago, and it is still popular today.

1.A man named Walter Scott had the first “diner” in 1872. Why is the word “diner” in quotation marks(引号)?

A.Because it is spelled differently from “ dinner”

B.Because the first diner was not what it is now

C.Because diner was a new word

D.Because it is a special kind of restaurant

2.What meals did the first diners serve?

A. only breakfast    B. Only lunch   C. Only night-meals  D. All of the above

3.According to paragraph 3, diners changed in __________

A. Two ways      B. three ways     C. four ways       D. five ways

4.Which of the following is NOT true according to the passage?

A.Diners existed before a fast-food restaurant

B.The menu included more food than sandwiches and coffee

C.Burger King is a fast-food restaurant

D.Sandwiches became bigger

5.The main idea of the passage is that ______________.

A. The diner is a traditional , popular place to eat in the United States

B.Samuel Johns built the first diner big enough to allow the customers to come inside

C.American diners serve many types of food 24 hours a day to their customers

D.Diners are different from fast-food restaurants in many ways

题型:解答题

铂钴标准比色法测定水的色度时,如果水样浑浊,可用离心机去除悬浮物,也可以用滤纸过滤除去。

题型:解答题

单户交易网点柜员应根据()、()接收的“失败清单”上的记录逐笔进行相应手工操作。

A、当日

B、次日

C、日始

D、日终

题型:解答题

有一个高压电容器,电容为1000pF,在1000V电压下漏电流为50μA.,求当频率为50Hz时,该电容器损耗系数是多少?

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