如图 客轮沿折线A 如图，客轮沿折线A─B─C从A出发经B再到C匀速航行，货轮从...
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\uff082\uff09\u8bbe\u8d27\u8f6e\u4ece\u51fa\u53d1\u5230\u4e24\u8239\u76f8\u9047\u5171\u822a\u884c\u4e86x\u6d77\u91cc\uff0e
\u8fc7D\u4f5cDF\u22a5CB\uff0c\u5782\u8db3\u4e3aF\uff0c\u8fde\u7ed3DE\uff0e\u5219DE=x\uff0cAB+BE=2x\uff0e
\u2235\u5728\u7b49\u8170\u76f4\u89d2\u4e09\u89d2\u5f62ABC\u4e2d\uff0cAB=BC=200\uff0cD\u662fAC\u4e2d\u70b9\uff0c
\u2234DF=100\uff0cEF=300-2x\uff0e
\u5728Rt\u25b3DEF\u4e2d\uff0cDE2=DF2+EF2\uff0c
\u2234x2\uff1d1002+(300-2x)2
\u89e3\u4e4b\uff0c\u5f97x=200\u00b1100\u221a6/3\uff0e
\u2235200+100\u221a6/3>200\uff0c
\u2234DE=200-100\u221a6/3\uff0e
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\u89e3\uff1a\uff081\uff09B\uff082\uff09\u8bbe\u8d27\u8f6e\u4ece\u51fa\u53d1\u5230\u4e24\u8239\u76f8\u9047\u5171\u822a\u884c\u4e86x\u6d77\u91cc\uff0c\u8fc7D\u70b9\u4f5cDF\u22a5CB\u4e8eF\uff0c\u8fde\u63a5DE\uff0c\u5219DE=x\uff0cAB+BE=2x\uff0c\u2235D\u70b9\u662fAC\u7684\u4e2d\u70b9\uff0c\u2234DF=12AB=100\uff0cEF=400-100-2x\uff0c\u5728Rt\u25b3DFE\u4e2d\uff0cDE2=DF2+EF2\uff0c\u5f97x2=1002+\uff08300-2x\uff092\uff0c\u89e3\u5f97x=200\u00b110063\uff0c\u2235200+10063\uff1e1002\uff08\u820d\u53bb\uff09\uff0c\u2234DE=200-10063\uff0e\u7b54\uff1a\u8d27\u8f6e\u4ece\u51fa\u53d1\u5230\u4e24\u8239\u76f8\u9047\u5171\u822a\u884c\u4e86\uff08200-10063\uff09\u6d77\u91cc\uff0e
设货轮速度为1，客轮速度为2，若是货轮从D往C行驶，因为AB=200，DC=100倍根号2，很显然将在BC上相遇，若是从D往A行驶，在同一时刻，客轮所跑的路程应该是货轮的两倍，则货轮沿A-B-C-A跑一圈时，货轮跑了半圈到达B，即D-A-B；接下来相当于货轮从B、客轮从A同时出发，则两船应该在C点相遇，因为客轮跑得路程AB+BC，正好是货轮跑得路程BC的两倍，所以答案是BB
连接BD，则△ABD是等腰直角三角形，假设E为AB的中点，有AB=2DE，此时DE最短；假设E点在线段AB上，但不在中点，根据已知可得AE=2DE，且AE＞AB，很明显假设不成立．故E点不在AB上，应该在线段BC上；
Brand-name electronic devices marketplace is stuffed with little "injury can't afford."
Power market
Industry and Commerce Bureau of Chengdu, Chengdu marketplace sell part of the electrical power high quality cookware item quality monitoring, the results unsatisfactory, 6 batches of substandard goods, the typical pass rate of 46% from the sample. Among them, five batches of goods related to output handle of the negative bias, making up 71.4% of the total number of substandard products. With much more and much more small household appliances to life, numerous consumers enjoy the particular of small appliances, but in addition by its imperfect product quality and service problems.
Brand-name marketplace is flooded. Quality brief board to become filled. Mr. Lee, who lives East Gate reflects he spent 300 yuan to buy a brand new soybean milk was used three times about the poor, simply because the plot is cheaper to purchase brand-name goods,CHI Hair Straightener, therefore the repair off calls has been no answer, no much more after-sales service about. This will undoubtedly permit consumers to tug little appliances skull. "Small home appliances don't durable, good quality one or 2 yrs, less than a month about the poor bad." Interview, a lot of customers told reporters. This is not the consumers fault, or perhaps the wrong use of, the relevant departments all over the test isn't tough to see,Hair Straighteners Ceramic, little appliances sampling pass rate is indeed not high.
It is understood that the very first quarter of this year, Chengdu Industrial and Commercial Bureau about the part of electric cookers item quality monitoring performed. The results demonstrated that six batches of substandard goods, Ed insulation electronic automatic rice cookers, induction of new flight, Delta boarded Heibang rice cooker. Monitoring of key signs and instructions for, protection against access to live parts, the input power and present, operating temperature with the leakage present and electric strength, moisture resistance,T3 Hair Straightener, leakage current and electric strength, stability and mechanical hazards, mechanical strength, structure, internal cabling, power connections and external cord, grounding,Ceramic Hair Straightener, and connecting screws,Ceramic Hair Straightener Ghd, electrical clearances, creepage distances and solid insulation, energy efficiency and power efficiency level limit values ??like 16 projects are already tested. Monitoring outcomes demonstrate that the project failed electric stove are: input power and present, power connection and external flexible cords, grounding, power efficiency, energy efficiency limit. It's understood the company sector distribution companies happen to be ordered to stop selling substandard goods electric stove, immediate rectification, the rectification and re-inspection before sale.
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