题目

COOL INVENTIONS From school to band Practice, the Venturi Eclectic is an Earth-friendly way to get Where you want to go．This battery-powered, zero-emission (meaning it doesn't pollute the air) vehicle runs mainly on renewable energy．Solar panels on the Eclectic's roof absorb sun rays when you're driving．On windy days, you can connect a machine to the car's roof that collects energy from the wind while you're parked．The Eclectic's top speed is 28 miles an hour; the battery lasts for 31 miles before it needs to be recharged．Zipping (迅速行进) around the neighborhood has never been 某同学要测量一石块的密度。他按以下设计的步骤进行了实验：A．在量筒中倒入适量的水，并记下水的体积V1B．将石块用细线系好后慢慢地放入量筒中（忽略细线的体积），并记下体积V2C．将石块从量筒中取出直接放到已经调好的天平上测得了石块的质量m（1）由图可知，该同学测得的石块质量为___________g,体积为__________cm3,由此计算出石块的密度为__________kg/m3。（2）按此步骤测得石块的密度值比真实值___________（选填“大”或“小”）。原因是________                                                       ___。（3）步骤A中“适量的水”的含义是_________________________。