题目

________the temperature, ________ water turns into steam. A. The high; the fast                  B. Higher; faster C. The more higher; the faster         D. The higher; the faster 答案：D某车以相同的功率在两种不同的水平路面上行驶，受到的阻力分别为车重的k1和k2倍，最大速率分别为v1和v2，则（ ）A．v2=k1v1 B． C． D．v2=k2v1