博物馆每天早晨9:00开门让游客进入,如果开放3个入口则在9:09可以让全部游客

题型:解答题

问题:

博物馆每天早晨9:00开门让游客进入,如果开放3个入口则在9:09可以让全部游客入场,如果开放5个入口,则可在9:05结束入场,假设入场结束前每分钟前来的游客数量不变,那么第一个游客到达博物馆的时间是8时几分?

考点:圆的面积
题型:解答题
计算下列各式的值.
(1)2sin30°+3tan30°+
cos45°
tan60°

(2)cos2 45°+cos30°•tan45°+sin2 60°.
题型:解答题

ma+na-a=a×______.

题型:解答题

For many people today, reading is no longer relaxation. To keep up their work they must read letters, reports, trade publications, interoffice communications, not to mention newspapers and magazines: a never ending flood of words. In (1) a job or advancing in one, the ability to read and comprehend (2) can mean the difference between success and failure. Yet the unfortunate fact is that most of us are (3) readers. Most of us develop poor reading (4) at an early age, and never get over them. The main deficiency (5) in the actual stuff of language itself—words. Taken individually, words have (6) meaning until they are strung together into phrases, sentences and paragraphs. (7) , however, the untrained reader does not read groups of words. He laboriously reads one word at a time, often regressing to (8) words or passages. Regression, the tendency to look back over (9) you have just read, is a common bad habit in reading. Another habit which (10) down the speed of reading is vocalization—sounding each word either orally or mentally as (11) reads.
To overcome these bad habits, some reading clinics use a device called an (12) , which moves a bar(or curtain) down the page at a predetermined speed. The bar is set at a slightly faster rate (13) the reader finds comfortable, in order to "stretch" him. The accelerator forces the reader to read fast, (14) word by word reading, regression and subvocalization practically impossible. At first (15) is sacrificed for speed. But when you learn to read ideas and concepts, you will not only read faster, (16) your comprehension will improve. Many people have found (17) reading skill drastically improved after some training. (18) Charlie Au, a business manager, for instance. His reading rate was a reasonably good 172words a minute (19) the training; now it is an excellent 1,378 words a minute. He is delighted that how he can (20) a lot more reading material in a short period of time.

A.quickly
B.easily
C.roughly
D.decidedly

题型:解答题

下列各项,风湿热的皮肤表现是()

A.蝶形红斑

B.环形红斑

C.出血点

D.紫癜

E.瘀斑

题型:解答题

)

更多题库