问题
选择题
Most products, ____ which this is one example, sell well, _______.
A．of; as advertised
B．of; like advertising
C．/; as an ad
D．/; like an ad
答案
答案：A
考查定语从句，介词of+which="of" most products，第二空填as advertised是省略式="as" they are advertised，句意是：大多数产品其中这就是个例子，卖的很好，就像做的广告一样。选A。
作为摆长；
得出周期；E．改变OM间细线的长度再做几次实验，记下每次相应的
，求出重力加速度g。