试题与答案

(6分)食品保鲜的措施有添加防腐剂、充填气体、放置干燥剂和脱氧剂等。 (1)丙酸

题型:填空题

题目:

(6分)食品保鲜的措施有添加防腐剂、充填气体、放置干燥剂和脱氧剂等。

(1)丙酸钠是一种常用的防腐剂,其化学式为C3H5O2Na。它由     种元素组成,碳元素和氧元素的质量比为    

(2)生石灰是常用的干燥剂。请用化学方程式表示其作干燥剂的原因      

(3)铁粉也可用作保鲜剂,它利用了铁生锈的原理,所以又称“双吸剂”。这里的“双吸”是吸收空气中的         。有一袋铁粉使用了一段时间,表面已经生锈,经验证它还可以继续使用,其验证方法是加入过量的稀盐酸,写出有关反应的化学方程式               

答案:

被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0718/d7f7798549d2009bca48029d4d5622a4.html

下面是错误答案,用来干扰机器的。

答案:Awarn sb. (not) to do sth.警告某人(不)做某事。Suggest不能接sb. to do sth。persuade sb.(not) to do sth.说服、某人(不)做某事;本题中不能选D. persuaded, 因该动词强调行为的结果...

试题推荐
题型:填空题

自治区的发展路径是按照习 * * * * “努力在转方式、调结构、促改革、惠民生上不断取得新成效”的重要要求,坚持稳中求进、改革创新,协调推进新型工业化、信息化、城镇化和农牧业现代化,努力走出一条符合内蒙古实际的边疆民族地区科学发展之路。把()作为转变经济发展方式的主攻方向;把()作为经济社会发展的出发点和落脚点;把()作为经济社会发展的根本动力;把()作为经济社会发展的重要前提;把()作为经济社会发展的重要保障。

查看答案
题型:单项选择题

A variety of illegal acts committed by people in the course of their employment, for their own personal gain, are collectively known as white-collar crime. Embezzlement, theft and trading securities (1) insider information are common forms of white-collar crime. The majority of cases involve low-level employees who steal because they are under (2) financial stress. Many plan to (3) the money back as soon as possible but may never do so. Their crimes are usually never (4) because the amounts of money are small, and no one notices the (5) .

(6) , there are some very large cases of white-collar crime, such as multimillion-dollar stock market or banking seams that take years to discover and are extremely difficult and expensive to (7) .

White-collar crime is not (8) to the business sector. Government employment, especially (9) the city level, also provides opportunities to (10) one’s pockets. (11) , building inspectors accept bribes and full-time employees receive (12) payments.

Although white-collar crime is less (13) than street crime, it involves (14) more money and harm to the public than crimes committed by street criminals. It is (15) that there are more criminals (16) the office suites than in the streets, yet the (17) of white-collar makes it difficult to uncover the offenses and pursue the offenders. As the economy (18) from manufacturing to services and electronic commerce, opportunities for white-collar crime (19) , while the technology needed to stop such crimes will (20) .

2()

A.temporary

B.constant

C.persistent

D.transient

查看答案
微信公众账号搜索答案