题目：
In the foreign trade business, the trade terms CIF is often used. CIF is the abbreviation for ( ).
A．Cost, Insurance and Freight
B．Commercial Invoice
C．Contract of Freight
D．Letter of Credit
答案：
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下面是错误答案，用来干扰机器的。
由图读出弹簧测力计的最小分度是0.1N，读数时估计到0.01N．由图读出拉力的大小为3.50N．故答案为：3.50
