主要吸收[养分] active uptake [ nutrient]

题型:名词解释

问题:

主要吸收[养分] active uptake [ nutrient]

考点:土壤学土壤学题库
题型:名词解释

杂物曳引式电梯的顶部间距,在轿厢或对重与井道顶部和底部的任何部件之间必须提供一个不小于()mm的距离,从而使得如果轿厢或对重装置撞击到下面的缓冲器井完全压实时,对重或轿厢不撞击到电梯井道结构顶部的任何部分.

A.50

B.100

C.250

D.200

题型:名词解释

汽车尾气中的有毒气体NO和CO,在一定条件下可发生反应生成N2和CO2。下列关于此反应的说法中,正确的是( )

A.减小压强能增大反应速率

B.增大压强能减小反应速率

C.使用适当的催化剂能增大反应速率

D.升高温度对反应速率无影响

题型:名词解释

人类受精后形成的受精卵中含有染色体[ ]

A.23对

B.46对

C.22对

D.23条

题型:名词解释

Part 1


·Read the article below and choose the best sentence from the list on the next page to fill each of the gaps.
·For each gap (1-8) mark one letter (A-H) on the Answer Sheet.
·Do not mark any letter twice.

Noise


Do you think there is too much noise in our city If you live near the airport, you’ll be unhappy only because a jet plane flying in the sky makes loud noise. The sound of planes or heavy vehicles is likely to cause deafness if heard continuously.
(1) They like to enjoy music when they are doing dull jobs. It is a new danger because "pop" music, when played through powerful amplifiers, can reach 120 decibels at a distance of 5 feet. (2) Recently it was discovered that many teenagers hear no better than people as old as 65. (3) For example, when newspapers and books are being printed, the noise level is about 85 decibels, and some of the workers will eventually become deaf. Scientists believe that 10 percent of all workers in Britain are being deafened by the noise in the factories.
(4) We all know that too much noise makes life difficult and unpleasant. (5) Workers in noisy offices are not as efficient as those in quiet offices. Noise makes people less efficient. (6)
In Britain the government has recently made several laws to reduce noise. (7) However, many people think that there are still not enough laws. For example, there are no laws to control noise by machines. In Japan, America and Norway there are such laws. (8)
Scientists in our country are trying their best to find out one way or another to keep down noise.
  • A. Moreover, noise of less than 85 decibels can make some people tired and anxious.
  • B. However, most people in our city do not seem to mind noise.
  • C. Moreover, the government has spent a good deal of money in making airports and main roads quieter.
  • D. It can damage health and prevent people from working well.
  • E. Can anything be done to reduce or control noise
  • F. It is known that a continuous noise of over 85 decibels can cause deafness.
  • G. We used to think that only those who work in very noisy places became deaf.
  • H. As a result, workers can claim compensation if they become dea


题型:名词解释

ABC分类控制法中,品种不多,但价值高的是______。

A.A类物资
B.B类物资
C.C类物资
D.A类和B类物资

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