Vitamins are organic compounds necessary in small amounts in the diet for the normal growth and maintenance of life of animals, including man.
They do not provide energy, (21) do they construct or build any part of the body. They are needed for (22) foods into energy and body maintenance. There are thirteen or more of them, and if (23) is missing a deficiency disease becomes (24)
Vitamins are similar because they are made of the same elements-usually carbon, hydrogen,oxygen, and (25) nitrogen. They are different (26) their elements are arranged differently, and each vitamin (27) one or more specific functions in the body.
(28) enough vitamins is essential to life, although the body has no nutritional use for (29) vitamins. Many people, (30) , believe in being on the "safe side" and thus take extra vitamins. However, a well-balanced diet will usually meet all t
A. exceptional
B. exceeding
C. excess
D. external
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A.1，2，3 B.1，3，4 C.1，2，4 D.1，2 [单选题]当今管理的新趋势：传统的物力、财力竞争转向企业对( )的竞 争。
A.市场瓜分能力 B.科技 C.人才 D.管理手段 [单选题] 2红色预警情报信息要在( )分钟内进行签收
A. 10 B. 15 C. 20 D. 25 [判断题]ICLAS 是一个以促进实验动物质量、健康和应用达到高标准的官方组织。 ( )
A.正确 B.错误 [判断题]国家安全生产监督管理总局负责全国危险化学品登记的监督管理工作。
A.正确 B.错误 [判断题]判断题:在计算差动分度交换齿轮时,假定等分数z必须大于等分数z。( )
A.正确 B.错误 [单选题]Ⅱ类移动式电气设备和Ⅲ类移动式电气设备修理后()原设计确定的安全技术标准。
A.可以降低 B.不得降低 C.可以稍微降低 [单选题]单钩桥式起重机启动回路中，三个凸轮控制器的零位触头是（）的。
A.并联 B.串联 C.混联 D.没有联系 [判断题]带电作业工具使用前应根据工作负荷校核机械强度，并满足规定的安全系数。（）
A.正确 B.错误 [单选题]下列哪项属于正反馈调节?( )
A.血糖浓度稳态 B.排尿反射 C.体温调节反射 D.屈肌反射 E.血压调节反射 [多选题]继电保护技术监督应按照依法监督、分级管理、专业归口的原则实行（ ）制度
A. 技术监督 B. 报告责任制 C. 目标考核 D.工作报告 我来回答: 提交
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