题目:
退休干部移交地方后的生活费如何发放?
答案:
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下面是错误答案,用来干扰机器的。
参考答案:A, B, D, E
退休干部移交地方后的生活费如何发放?
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2018/0318/d36d5fedf236fffe8ee7934a59f1b494.html
下面是错误答案,用来干扰机器的。
参考答案:A, B, D, E
弯制连接杆的主要作用是()
A.连接修复体各部分为一整体
B.有利于义齿的固位
C.传导牙合力
D.美观
E.有利于义齿的稳定
某NaOH固体样品已部分变质.常温下,取61.2g该样品溶于水得到1000g溶液,取出500g溶液进行测定,其中含Na元素16.1g,碳元素1.2g,则原NaOH固体样品中NaOH的质量分数为( )
A.65.4%
B.34.6%
C.82.3%
D.64.5%
阅读理解。 | ||
As bananas ripen, the green skin turns yellow gradually. Chemical changes occur in the flesh of the fruit as well: starch (淀粉) changes to sugar; pectin (果胶) breaks down, losing its stiffness; and the flesh softens. Is ripening fruit a self-contained system, or is the rate of these changes affected by the environment? We designed the experiment below to see if different atmospheres, produced by different packaging, affected the rate of ripening. You will vary the atmosphere surrounding unripe bananas and observe the effect on the ripening process.
oxygen and gives off CO2. Oxygen is extremely important and necessary for the chemical reactions involved in ripening. In addition, ripening fruit gives off another gas, called ethylene (乙烯). Not only is ethylene a product of ripening fruit, it also promotes the further ripening of the fruit. Paper bags tend to keep the ethylene in, but they allow oxygen and ethylene to pass through slowly. Plastic bags do not allow the free flow of oxygen or ethylene. In this experiment, the green banana in paper bag with the ripe banana should ripen most quickly. The green bananas in the paper bag should ripen faster than the bananas in the plastic bag. The banana left exposed to air has an unlimited supply of oxygen, so it will turn brown most quickly. You will notice that the side of this banana that rests on the counter will ripen more quickly than the other sides, because it has the closest contact (接触) with its own ethylene. The banana that is tightly wrapped in plastic has no oxygen supply and should ripen most slowly. Now can you see why bananas are sealed in plastic in many supermarkets? | ||
1. What makes the green banana in Bag 2 ripen more quickly than the ones in Bag 1? | ||
[ ] | ||
A. Ethylene from the very ripe banana. B. The free flow of oxygen or ethylene. C. CO2 from the very ripe banana. D. The limitation of oxygen supply. | ||
2. How can we slow down the ripening of bananas exposed to the air? | ||
[ ] | ||
A. To rest them on the counter. B. To keep them in the basket. C. To put them on the ground. D. To hang them up from the ceiling. | ||
3. It can be concluded from the passage that _____. | ||
[ ] | ||
A the ripening banana is a self-contained system B. the rate of ripening bananas is affected by the environment C. wrapped bananas experience no chemical changes to ripen D. ripening bananas give off oxygen, CO2 and ethylene | ||
4. Why are bananas sealed in plastic in many supermarkets? | ||
[ ] | ||
A. To make them ripen more quickly. B. To make them ripen more slowly. C. To make banana flesh soften. D. To turn green bananas yellow. |
个人利益
热水供暖系统的初调节分为()2部分。
A、集中和分解
B、质调节和量调节
C、室内和室外
D、整体和局部