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There are 5 IQ Test questions in this part. For each question there are 4 choices marked A, B, C and D, Mark your answer on the Answer Sheet with a single line through the centre. Two aeroplanes are flying straight towards each other. One is traveling at 10 kilometres per minute, and the other at 15 kilometres per minute. Assuming that the planes are exactly 1,000 kilometres apart, what distance will be between them one minute before they crash into each other
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There are 5 IQ Test questions in this part. For each question there are 4 choices marked A, B, C and D, Mark your answer on the Answer Sheet with a single line through the centre. Different foods are to be found OD three shelves in a fridge. Butter is kept below the eggs while cheese is kept above the milk. The butter is also above the milk, but the eggs are on the same shelf as the yoghurt. The ice cream is above the cheese. What is on the bottom shelf
There are 5 IQ Test questions in this part. For each question there are 4 choices marked A, B, C and D, Mark your answer on the Answer Sheet with a single line through the centre. Which word completes the sentence Controversy is to quarrel as agreement is to ______．
电动自行车是目前一种较为时尚的代步工具，某厂生产的一种电动自行车，设计质量(包括人)为m=80kg，动力电源选用能量存储量为“36V10Ah”(即输出电压为36V，工作电流与工作时间的乘积为10安培小时)的蓄电池(不计内阻)，所用电源的额定输出功率P=180W，由于电动机发热造成的损耗(其它损耗不计)，自行车的效率为η=80%。如果自行车在平直公路上行驶时所受阻力跟行驶速率和自行车对地面的压力的乘积成正比，即f=kmgv，其中k=5.0×10 -3 s·m -1 ，g=10m/s 2 ，求： 自行车电动机的内阻为多少？
物体A、B的质量相等，把它们加热到相同的温度，然后再把它们分别放入等量、同温度的水里，A物体能使水温升高10℃，B物体能使水温升高20℃，设A的比热为C1，B的比热为C2，则______。
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