Before the mid-nineteenth century,
people in the United States ate most foods only in season. Drying, smoking, and
salting could preserve meat for a short time, but the availability of fresh
meat, like that of fresh milk, was very limited, there was no way to
prevent spoilage, But in 1810 a French inventor named Nicolas Appert
developed the cooking-and-sealing process of canning. And in the 1850’s an
American named Gail Borden developed a means of condensing and preserving
milk. Canned goods and condensed milk became more common during the 1860’s, but supplies remained low because cans had to be made by hand. By 1880, however, inventors had fashioned stamping and soldering machines that mass-produced cans from tinplate. Suddenly all kinds of food could be preserved and bought at all times of the year. Other trends A. Causes of food spoilage B. Commercial production of ice C. Inventions that led to changes in the American diet D. Population movement in the nineteenth century 热门试题:[单选题]有关蛤蚧性状描述,不正确的是
A.呈扁片状,头呈扁三角形,无眼睑 B.全身密被类圆形微有光泽的细鳞 C.四足均有5趾,均具爪,趾间仅具蹼迹 D.吻部半圆形,吻鳞不切鼻孔,与鼻鳞相连 E.尾细而坚实,有明显的6~7个银灰色环带 [多选题]《中国铁路上海局集团有限公司行车组织补充规定》(上铁运[2018]138号)规定,动车组列车在车站办理客运业务时必须固定( )。
A.股道 B.站台 C.线路 D.停车位置 [多项选择]国家机关包括()
A. 国家权力机关 B. 国家行政机关 C. 国家审判机关 D. 国家检察机关 E. 国家军事机关 [判断题]农业标准按性质可划分为强制性标准和推荐性标准。我国农业国家标准、.行业标准是强制性标准,地方标准属于推荐性标准。
[多选题]民主生活会是党内政治生活的重要内容,是()的重 要方式。
A.依靠领导班子 自身力量解决 矛盾和问题 B.发扬党内民主 C.加强党内监督 D.开展学习教育 [填空题]温中散寒剂药名:()功效:温中散寒,健胃主治:脾胃虚寒,呕吐泄泻,胸满腹痛,消化不良药物组成:姜、党参、土白术、炙甘草。
[填空题]党纪处分的批准权,是指()批准党纪处分的权力。
[判断题]二叔丁基乙二胺属于不燃液体。
A.正确 B.错误 [单项选择]一台压缩机功率为100kw,满负荷工作大概需()t水来冷却(假定冷却水的问升为100C)。
A. 12 B. 15 C. 3 D. 8.6 [判断题]CCBⅡ制动机单独制动手柄还具有快速缓解功能,通过在制动区斜推小闸手柄实现缓解小闸控制所产生的制动力。( )
A.正确 B.错误 [简答题]世界五大宫包括法国凡尔赛宫,英国白金汉宫,美国白宫,俄罗斯克里姆林宫和北京的什么?
[单选题]进山之时,来自北方凌厉的寒流________起伏陡峭的大巴山,与________的暖空气交汇厮杀,忽雨忽雪忽雾。
填入画横线部分最恰当的一项是:
A.遭受 生机勃勃 B.遭到 岌岌可危 C.经受 奄奄一息 D.遭遇 一息尚存 [多项选择]下面关于勤劳节俭的说法,正确的是()。
A. 消费可以拉动需求,促进经济发展,因此提倡节俭是不合时宜的 B. 勤劳节俭是物质匾乏时代的产物,不符合现代企业精神 C. 勤劳可以提高效率,节俭可以降低成本 D. 勤劳节俭有利于可持续发展 [多项选择]It is often said that the subjects taught in schools are too academic in orientation and that it would be more useful for children to learn about practical matters such as home management, work and interpersonal skills. To what extent do you agree or disagree
You should write no less than 250 words. [单选题]作业人员搬运推力轴瓦或导轴瓦过程中,应协调一致避免设备坠落伤害事故。
A.A.正确 B.B.错误 [单选题]隧道采用反向出洞必须编制出洞专项施工方案,出洞前不少于()必须按设计 完成洞口及边仰坡加固工程。
A.10m B.20m C.30m D.40m [单选题]污名化:一个群体将人性的低劣强加在另一个群体之上并加以维持的动态过程,它是将群 体的偏向负面的特征刻板印象化,并由此掩盖其他特征,成为在本质意义上与群体特征对 应的指称物,在这个过程中,处于强势且不具污名的一方最常采用的一种策略,即“贴 标签”。
下列现象不属于污名化现象的是( )。
A.a.某市治安日益恶化,市民都抱怨是农民工流人城市的恶果 B.b.杭州出生的魏某鄙视农村来的姜某,认为他邋遢土气,没文化 C.c.某餐馆打出招聘广告:“本餐馆招收服务员一名,x x省的人一概不考虑” D.d.在旧上海,苏北人被视为懒惰的群体,被排除在上海人通婚圈之外 [填空题]()是指对冰栋原料进行解栋,对鲜洁原料进行宰杀、洗涤和初步整理。
[单选题]离心式压缩机机组试车的步骤是( )。(①润滑系统的试车;②电动机的试车;③电动机与增速器的联动试车;④压缩机的负荷试车;⑤压缩机的无负荷试车)
A.①②③④⑤ B.①②③⑤④ C.②①③④⑤ D.②①③⑤④ [简答题]带传动中,打滑和弹性滑动有什么不同?
[单选题]精子获能发生在:
A.睾丸 B.附睾 C.输精管 D.射精管 E.女性生殖管道 [单选题]在平直线路上测量车钩高度,空车870~890mm,重车车钩高度转K2型载重60t车钩高( )mm且均不低于815mm。
A.A≤855 B.B≤815 C.C≤835 D.D≤895 [单项选择]Women are quite often competent drivers, but they are very seldom consistently first class. At best they are a mild hazard, at (62) potentially lethal.
A wise male driver will always give them plenty of roads and still be on the lookout for the (63) to happen. This (64) has nothing to do with their lack of ability to cope with the (65) complexities of the vehicles; it is due to an inherent (66) which, in certain other circumstances, may be highly desirable, (67) which, behind the wheel, is deadly. It is their (68) for talking. Women together in a car yield (69) this need and when they talk they look into each other’s faces. Simple words are (70) It is necessary for them to see the expression which (71) the words and so read the meaning the words left unsaid. (72) two women in the front of a car repeatedly (73) each other’s attentio A. lust B. greediness C. longing D. ambition [多选题] 犯罪嫌疑人可能被判处(),没有委托辩护人的,公安机关应当及时通知法律援助机构为犯罪嫌疑人指派辩护律师:
A. 7年以上有期徒刑 B. 10年以上有期徒刑 C. 无期徒刑 D. 死刑 [单选题]在封闭厂房(密闭容器内等有限空间)作业和深夜班、加班作业时,必须安排( )人以上一起工作。
A.2 B. 3 C. 4 D. 5 [多选题]关于血清蛋白的叙述,正确的是
A.血清总蛋白降低一般与清蛋白减少相平行 A.清蛋白含量与有功能的肝细胞数量呈正比 B. C.清蛋白持续降低提示预后不良 D.总蛋白升高主要以球蛋白升高为主 [判断题]列车晚点4min以上,10min以下,属于B类信息。
A.正确 B.错误 [判断题]不同花纹的轮胎可装在同一车轴的左右两边使用。
A.正确 B.错误 [判断题]电气设备的铜、铝接头要做过渡处理。
A.正确 B.错误 [判断题]在氧气瓶和乙炔瓶发生冻结时,应用热水或蒸汽解冻,严禁用火烤或用金属工具敲打,氧气瓶与乙炔瓶距离明火在10米以上,两者间距离应在5米以上。
A.正确 B.错误 [单项选择]男性,62岁,胃溃疡病史3年,一年来上腹痛发作频繁,无规律,体重减轻。
患者粪便隐血试验(+),胃酸pH6.0。腹部B超示:肝脏实质均匀。胃镜示:胃窦部直径3cm溃疡边缘隆起。最适宜的治疗为 A. 胃癌根治术 B. 胃大部切除术 C. 腹腔动脉栓塞化疗 D.胃空肠吻合术 D. 全身静脉化疗 [单项选择]辖内往来对账分级管理由()负责辖内往来办法的制定,并对执行情况进行监督和管理
A. 支行 B. 二级分行 C. 省行 D. 总行 [单项选择]Hong Kong was so busy over the Spring,Festval that all the hotel accommodation was full.She phoned several hotell but none of them had a( )room.
A. cheap B. nice C. separate D. vacant [判断题]梯子未锁牢挂稳前,严禁攀登。
A.正确 B.错误 [判断题] 重大危险源是指长期地或临时地生产.搬运.使用或者储存危险物品,且危险物品的数量等于或者超过临界量的单元。
A.正确 B.错误 [单选题]膀胱破裂最可靠的诊断方法是()
A.排泄性尿路造影 B.膀胱造影 C.膀胱镜检查 D.导尿试验 E.置尿管导出血尿 我来回答: 提交
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