某发电站的输出功率为，输出电压为4kV，通过理想变压器升压后向80km远处供电。已知输电导线的电阻率为，导线横截面积为，输电线路损失的功率为输
阅读理解。 Yesterday afternoon，it was very hot.Mr. Green with his family decided to go swimming.There was a new and large swimming pool near their house.It was free for the first week.So they
已知（其中i为虚数单位）， 则以下关系中正确的是 （ ） A．
My daughter, all kinds of meat, would not like to eat any vegetable, which worries me a lot. A. devoted to B. addicted to C. accustomed to
化学就在我们身边，与我们的生活息息相关。请回答以下生活中的问题： （1）“沙里淘金”说明黄金在自然界中能够以 (填“单质”或“化合物”)形
某人因身体不适，全身浮肿，去医院作尿液检查，化验师做了如下操作：①取稀释尿液2 mL；②加0.1 g/mL的NaOH溶液2 mL，摇匀；③加0.01 g/mL的CuSO4溶液3～4
读下图，a地区治沙工作卓有成效，d地区农业应走的道路是 A．商品农业 B
，则不等式
的解集为 ( )
B．
C．
D．
