更多“仰韶文化时期属于新石器时代的哪个时期”相关的问题
兼防直接接触和间接接触电击的措施中，保证电气设备正常工作和防止触电的基本绝缘是（ ）。 A．工作绝缘 B．保护绝缘 C．双重绝缘 D．加强绝缘
A.工作绝缘
B.保护绝缘
C.双重绝缘
D.加强绝缘
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用手推车运输爆破器材时，应采取防滑、防摩擦和防止产生火花等安全措施。
A.对 B.错
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下列表面活性剂有起昙现象的是A.肥皂B.硫酸化物C.磺酸化物D.季铵化物E.吐温
下列表面活性剂有起昙现象的是 A.肥皂 B.硫酸化物 C.磺酸化物 D.季铵化物 E.吐温
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I型呼吸衰竭可出现（)。
A.PaO2＜60mmHg(7.89kPa)
B.PaO2＞50mmHg(6.65kPa)
C.两者均有
D.两者均无
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昔日惜别不释怀，银钗莫再镜后藏（宋词三句连）（）。
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蒸馏法适合分离（）
A.固态样品
B.气态样品
C.液态样品
D.结晶态样品
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Roger lived in the city of London, and his hair was always cut by the same old man. He always cut Roger's hair as Roger liked it, and while he was doing it, the two men talked about football. One day, when Roger was sitting in his chair, and his hair was being cut as usual, the old man said to him, 'Roger, I'm going to be seventy years old next month and I feel tired, so I'm going to sell my shop to a young man. He liked to cut hair for people.' Roger was sorry to hear that, because he enjoyed talking to the old man, and he was also worried that his hair would not be cut as well by the new young man as it had been for so many years by his old friend. He went to the shop again the next month, and the new young man was there. He cut Roger's hair, but he did it badly. The next month, Roger went into the shop again. The young man asked him how he would like his hair cut, and Roger answered, 'Please cut it very short on the right side, but leave it as it is on the left. It must cover my ear. On top, cut all the hair away in the middle, but leave a piece at the front.' The young man was very surprised when he heard this, 'But sir,' he said, 'I can't cut your hair like that!' 'Why not?' Roger asked. 'That's how you cut it last time.'Who always cut Roger's hair?A．His new friend.B．A young man.C．An old woman.D．His old friend.
A.B.'C.D.E.'F.'WhoG.HisH.B．AI.C．AnJ.D．His
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1894年，日军在旅顺立下了一块“清国将土阵亡之墓”的木碑，日军的企图是（）
A.威胁中国人民
B.掩盖他们杀人的罪行
C.引诱清军放下武器
D.为中日议和奠定基础
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测量塑料型材外形尺寸和壁厚，用游标卡尺各测量（）。
A.二点 B.三点 C.四点 D.五点
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有段电阻为4Ω的导线，把它对折起来作为一根导线用，电阻为（）。
A.2Ω
B.1Ω
C.8Ω
D.16Ω
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下列不是电缆桥架特点的是（）。
A、造价低
B、强度大
C、配线灵活
D、施工复杂
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0——0的营销模式主要强调指线上与线下之间关系的打通（）
A．正确B．错误此题为判断题(对，错)。
B．错误此题为判断题(对，错)。
此题为判断题(对，错)。
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安全可靠是顾客对餐饮企业品牌产品质量的最基本要求。()
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流体介质工作温度高，其管线的轴向（）就大。
A . A、压力
B . B、剪力
C . C、拉力
D . D、应力
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某综合大楼，建筑高度为48m，地上十层，地下一层，每层建筑面积为1950m2，设有中央空调系统，两部疏散楼梯间，两部电梯，一部自动扶梯。 请分析以上案例，回答下列问题： (1)该建筑应设几部消防电梯? (2)该建筑空调系统风管在哪些部位应设置防火阀? (3)该建筑消防用电设备的配电线路能否采用明敷，如果可以，应满足什么条件?
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