The first man who cooked his food, instead of eating it raw, lived so long ago that we have no idea who he was or where he lived. We do know, however, that 56 thousands of years food was always eaten cold and 57 . Perhaps the cooked food was heated accidentally by a 58 fire or by the melted lava from an erupting 59 . When people first tasted food that had been cooked, they found it tasted better. However, 60 after this discover, cooked food must have remained a rarity 61 man learned how to make and light 62 .
Primitive men who lived in hot regions could depend on the heat of the sun 63 their food. For example, in the desert 64 of the southwestern. United States, the Indians cooked their food by 65 it on a flat 66 in the hot sun. They cooked piece of meat and thin cakes of com meal in this 67 . We surmise that the earliest kitchen 68 was stick 69 which a
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Energy Crisis{{/B}} One key question for the next century is how we provide energy in an environmentally sound way. As living standards rise in the developing world, energy consumption will increase. As a result, many countries are now opening the door for private investment in a sector that used once to be solely the preserve of government. In the developed world, the move is towards the deregulation and privatization of electricity generation and distribution. There is also a trend towards locally-generated energy, particularly in the developing world. Factories and shopping centers may one day have their own power sources. Progress is also being made in minimizing the environmental impact of energy production and consumption. A A. In the developing countries, there is a trend toward locally-generated energy. B. In the developed world, clean power is used in motor cars. C. A motorcar today puts out perhaps 5 times of the pollution a new car did in 1970. D. Factories and shopping centers are able to have their own power sources. [单项选择]A系统产品在休闲模式下看电影应该把角度调整到()度
A. 45 B. 10 C. -5 D. 2.57 [单选题]吊装带按照标签给予的定值选用时,可不考虑承重方式。
A.正确 B.错误 C.略 D.略 E.略 F.略 [多选题]《铁路常旅客服务办法》规定:会员可通过( )设置受让人。
A.网站 B.自动售票机 C.车站会员服务窗口 D.铁路客户服务中心 [判断题]邻近营业线B 类施工应设置防护设施,防护设施纳入施工方案并经集团公司主管业务处室审批,确不能设置防护设施时纳入集团公司月度施工计划。《普速铁路营业线施工安全管理实施细则》( )
A.正确 B.错误 [多项选择]输水管线应避免穿越______和河水淹没也冲刷地区,以降低造价和便于管理。
A. 滑坡 B. 高地下水位 C. 岩层 D. 沼泽 [单选题]悬空作业时必须()。
A.设置生命绳 B.设置救生设备 C.经过体检 D.携带工具 [单选题]υmax≤120km/h线路上,钢轨母材轨顶面凹陷或接头马鞍形磨耗( )mm,应及时处理。
A.>0.2 B.>0.3 C.>0.5 D.≥0.5 [单项选择]下面哪种药物不属于大环内酯类抗生素()
A. 红霉素 B. 土霉素 C. 罗红霉素 D. 替米考星 [单选题] 特种设备检验、检测机构出具虚假的检验、检测结果和鉴定结论或者检验、检测结果和鉴定结论严重失实的,责令改正,对该机构处( )罚款
A. 一万元以上十万元以下 B. 两万元以上二十万以下 C. 五万元以上二十万元以下 D. 十万元以上二十万元以下 [单项选择]治疗湿热蕴结型之鼓胀,宜选用
A. 实脾饮 B. 舟车丸 C. 中满分消丸 D. 五苓散 [单选题]130.杆塔按材质分类有( )。
A.A.木杆、水泥杆、金属杆 B.B.铁塔、钢管杆、型钢杆 C.C.锥形杆、等径杆 D.D.直线杆、耐张杆、转角杆 我来回答: 提交
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