更多“直流电机电枢反应的结果为（）”相关的问题
Complete the sentences by using infinitives. Add a preposition after the infinitive if necessary.I can’t wait ______ my family again! It’s been a long time!
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燃料破碎中无烟煤的特性：含水量低、性脆、（）。
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患儿1岁，因腹泻4天入院，考虑为轮状病毒性肠炎，查体：精神稍差，略有烦躁不安，皮肤稍干燥，弹性好，眼眶稍凹陷，尿量可，查电解质Na+125mmol／L。血气分析为：pH7．38，PCO232mmHg，HCO310mmol／L，BE-10mmol／L。该患儿酸中毒的原因可能为（）
A.碱性物质经消化道丢失 B.摄入的酸性物质过多 C.静脉输液中不含碱性液 D.产酸过多 E.排酸障碍
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孙策死时多少岁？（）
A.二十六B.二十九C.三十二D.三十五
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In some countries there is a fixed charge for personal services. A certain percentage may be added to the bill at a hotel or restaurant "for the service".In other places the customer may be expected to give a tip, or a small amount of money, as a sign of appreciation whenever services are performed. In the United States there is no standard practice in regard to tipping. The custom is more common in a large city than in a small town. A native American may often be in doubt about when and how much to tip when he is in a city that is strange to him. In general, however, a tip is expected by the porter who carries your baggage, by taxi drivers(except, perhaps, in a small town), and by those who serve you in hotel and restaurants.When you pick up your incoming baggage at an airport, you may tip the man who takes it to the taxi or airport bus. He usually expects one dollar a bag for his service. In some cities the taxi that takes you to your hotel may have one meter (计价器)that shows the cost of the trip and another that shows a fixed charge, usually about 50 cents, for "extra". In some cities the taxi driver may expect a tip in addition to the "extra", especially if he carries your suitcase. If no "extra" is charged, a tip is usually given. Hotels generally do not make a service charge, though there are places where one is added. It is customary (惯常的), however, to give something to the porter who carries your suitcases and shows you to your room. In case of doubt, one dollar for each bag he carries is satisfactory. In a restaurant you generally leave about 15 percent of the bill in small change on that table as a tip for the person who has served you. A service charge is generally not included in the bill except in some of the larger, more expensive places. If the order is small----a cup of coffee at a lunch counter, or something of the sort----a tip is not usually expected.
A．Americans sometimes are not sure how to tipB．people in large towns know more about tippingC．one has to tip no matter how big or small the order isD．people sometimes don"t tip when they are not satisfied
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某企业生产某产品，固定成本为160000元，单位变动成本为10000元，每台售价为12000元，试计算该产品的盈亏平衡点是（）。
\tA.14台
\tB.18台
\tC.70台
\tD.80台
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有司机操作：此操作与无司机操作相比是不能自动关门。
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防止炉膛爆炸，因此燃煤炉改为燃油（气）炉时，当燃油雾化不良或燃烧不完全的油雾和瓦斯在炉膛或炉尾部受热面聚集时，就会发生着火或爆炸.因此在锅炉的适当部位应装设（），同时在自动化控制上应增设点火程序控制和熄火保护装置，以保证锅炉安全运行。
A、防爆门
B、炉门
C、灰门
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由2心皮发育成的果实有（）
A、角果
B、瘦果
C、荚果
D、双悬果
E、蓇葖果
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在液压传动中，压力的大小取决于油液流量的大小。
（3.0分）
华侨受到中国政府保护始于（）。
A.明代 B.洋务运动后 C.甲午战后 D.国民党政府时期
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What is the authors attitude towards European reaction against American spying?
A.Indifferent.B．Optimistic.C．Skeptical.D．Intolerable.
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当链斗船不受挖槽宽度、挖槽边缘水深限制时链斗船宜采用（）施工。
A.斜向横挖法
B.扇形横挖法
C.十字横挖法
D.平行横挖法
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液压油泵切换时，对备用泵的启动只要其遵循齿轮泵的启动规程，没有其它要求。（）
A . 正确
B . 错误
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