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【单选题】
Basic Electrical Safety Precautions and Procedures: Safety is all about preventing accidents. Personal injury typically occurs because safety precautions are either not learned, or they are not practiced. This safety manual is offering some basic safety procedures and precautions to help ensure your safety when servicing your appliances. If you cannot operate basic tools, you should not attempt to maintain or repair any of your major appliances. Call an appliance repair technician if any repair or maintenance procedure is not understood. Keep a first aid kit near by. Be aware of and know how to use the contents of the first aid kit. It is also a good idea to have a fire extinguisher handy just in case of an emergency. SAFETY PROCEDURES: Safety precautions are relatively similar for all of the major appliances. Make sure to pay close attention to any and all safety cautions and warnings posted on the appliance being serviced. Understanding and adhering to these safety tips can greatly reduce the risk of personal injury. Individual Safety Precautions: Protecting yourself from injury and harm is absolutely imperative. We strongly suggest that before you begin to maintain, install or service any of your appliances that you strictly adhere to each of the following: Always wear gloves. A sharp edge on an appliance can hurt and/or cut your hands. Be sure to wear safety boots. You can cause serious injury to unprotected feet by dropping any heavy appliances or tools. Refrain from wearing loose clothing. Loose clothes can get caught in an operating appliance. Remember to remove any jewelry when servicing an appliance. Wear safety glasses to guard your eyes from any dust or flying debris. Make sure you use the correct tools and that they are clean and in good condition. When does personal injury usually happen?
A.
When a person does not refer to a safety manual.
B.
When a person is not aware of safety precautions.
C.
When a person tries to fix home appliances alone.
D.
When a person doesn't have a first aid kit.
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参考答案:
举一反三
【简答题】判断集合A={2,3,4,5}与集合B={x丨2x+3=9}的关系。
【多选题】下列关于内含报酬率法的说法中,正确的有______。
A.
对于独立投资方案的比较决策,如果各方案原始投资额现值不同,可以通过计算各方案的内含报酬率,反映各独立投资方案的获利水平
B.
内含报酬率反映了投资项目实际可能达到的投资报酬率,易于被高层决策人员所理解
C.
在互斥投资方案决策时,如果各方案的原始投资额现值不相等,可以用内含报酬率法作出正确的决策
D.
只有当项目投产后的现金净流量表现为普通年金的形式时才可以直接利用年金现值系数计算内含报酬率
【判断题】采用FDM技术可以在一条物理信道上传输多个数字信号。
A.
正确
B.
错误
【多选题】固溶体结晶的条件是
A.
过冷
B.
溶质浓度重新分配
C.
液态金属中的短程有序集团达到临界尺寸
D.
温度足够低
【单选题】集合A={1,2,3}与集合B={1,4,5} 的交集是 ( )
A.
{1}
B.
{1,2}
C.
{1,3}
D.
{1,2,3,4,5}
【简答题】设集合A={x||x-a|<1,x∈R},B={x||x-b|>2,x∈R}求集合A与B;若A?B,a,b∈{1,2,3,4,5},求出所有满足条件的有序实数对(a,b).
【判断题】溶质与溶剂的晶体结构相图,是置换固溶体形成无限固溶体的必要条件。
A.
正确
B.
错误
【单选题】已知集合A={x,1},B={y,1,2,4},且A是B的真子集.若实数x与y都在集合{0,1,2,3,4}中,则不同的集合{x,y}共有(  )
A.
4个
B.
5个
C.
6个
D.
7个
【多选题】固溶体结晶的条件是。
A.
过冷度
B.
结构起伏
C.
能量起伏
D.
成分起伏
【判断题】6岁儿童脑重量基本达到成人水平。
A.
正确
B.
错误
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