运一批煤,第一次运走这批煤的310,第二次运走31t,还剩下5.4t,这批煤共多

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问题:

运一批煤,第一次运走这批煤的
3
10
,第二次运走31t,还剩下5.4t,这批煤共多少吨?
考点:分数除法及应用
题型:解答题

离心式压缩机吸入气体压力相同,则()。

A.密度大的气体可产生较高的最终压力

B.密度小的气体可产生较高的最终压力

C.吸入气体的密度与最终压力无关

D.吸入密度大的气体可产生较低的最终压力

题型:解答题

1787年宪法规定美国实行的政体是

A.联邦共和制

B.君主立宪制

C.议会共和制

D.责任内阁制

题型:解答题

基因型为AB/ab的个体,在形成配子过程中,有20%的初级精母细胞发生了互换。若此个体产生了10000个精子,则从理论上讲可形成aB的精子()

A500个

B1000个

C2000个

D2500个

题型:解答题

Aspirin is one of the safest and most effective drugs invented by man. The most popular medicine in the world today, it is an effective pain reliever. Its bad effects are relatively mild. It is also cheap.For millions of people suffering from arthritis, it is the only thing that works. Aspirin, in short, is truly the 20th-century wonder drug. It is also the second largest suicide drug and is the leading cause of poisoning among children. It has side effects that, although relatively mild, are largely unrecognized among users.Although aspirin was first sold by a German company in 1899, it has been around much longer than that. Hippocrates, in ancient Greece, understood the medical value of tree barks and leaves which today are known to contain a chemical found in aspirin. During the 19th century, there was a great deal of experimentation in Europe with this chemical, and it led to the introduction of aspirin. By 1915, aspirin tablets were available in the United States.A small quantity of aspirin relieves pain and inflammation. It also reduces fever by affecting some of the body’’s reactions. Aspirin is very irritating to the stomach lining. The best way is to chew the tablets before swallowing them with water, but few people can stand the bitter taste. Some people suggest crushing the tablets in milk or orange juice.

Aspirin was invented in________.

A.the 20th century

B.the 19th century

C.ancient Greece

D.ancient Germany

题型:解答题

A.条件(1)充分,但条件(2)不充分。

B.条件(2)充分,但条件(1)不充分。

C.条件(1)和(2)单独都不充分,但条件(1)和条件(2)联合起来充分。

D.条件(1)充分,条件(2)也充分。

E.条件(1)和(2)单独都不充分,条件(1)和条件(2)联合起来也不充分。

等比数列{an}的公比为q,则q>1.
(1)对于任意正整数n,都有an+1>an;(2)a1>0.

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