题目

The Spring Festival is the    36   New. Year's Day. It usually comes    37  February. Everyone in China   38  the Spring Festival very much.    39   the Spring Festival comes, Wei Fang usually   40  her parents    41  their house,    42 do some shopping and   43  housework..    ___44 that day everyone in China   45  Jiaozi , New Year's cake and   46  other delicious food. Wei Fang likes New Year's cake, but  47   parents say Jiaozi is    48   than New Year's cake. Many  49  usually wear new clothes on Spring Festival. The Chinese p 在做共点力合成的实验中，若测F1时弹簧测力计上的弹簧与其外壳发生了摩擦，则势必会引起F1和F2的合力F发生偏差，把F与真实值相比较，F的大小偏________．