If you think a Web site designed especially for complaining sounds unique, then think again. If you have a complaint, there are hundreds of sites that allow you to get it off your chest. Sites exist f
一般在海河交汇处，当淡水与海水相遇时，淡水会自然地向海水渗透并产生渗透压，这种能量被称为“盐差能”。实验表明，当海水含盐度为3.5%时，其
——There must be a dozen pens in this house but I can never find one when I need one. ——Keep looking. ______is sure to turn up. A. One B. It C.
A California family drives a car that could help protect the environment. When Jon and Sandy go to the store or to their daughters' soccer games, they drive in hightech style. They drive a $1 mil
酵母菌与大肠杆菌都具有的膜结构是（ ） A、核膜 B、内质网 C、核糖体 D、细胞膜
当人所处的环境温度从25℃降至5℃时，耗氧量、尿量及体内的酶活性的变化依次是 A．减少、增加、不变 B．
一客轮逆水行驶，船上一乘客掉了一件物品，浮在水面上，等乘客发现后，轮船立即掉头去追，已知轮船从掉头到追上共用5分钟，问乘客丢失了物品，
阅读下列材料 代议制又称议会制，是指由选举产生的代表民意的机关来行使国家主权的制度，这种代表民意的机关就是议会。代议制最早在英国产生，
，则
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