【单选题】Section B Directions: In this section, you will hear 3 short passages. At the end of each passage, you will hear some questions. Both the passage and the questions will be spoken only once. After you ...
A.
It took place in Chicago in 1859.
B.
Four cars powered by petrol took part in it.
C.
only one carmaker, Henry Ford was unable to take part in it.
D.
Henry Ford had no car to take part in it.
【简答题】设一个测试库包含s1和s2。s1=ab, s2=ac. 以字母为最基本单位计算下面各题。 (下列数值始终保留两位小数,如0写成0.00, 0.5写成0.50, 1写成1.00。如有多余小数,数值四舍五入。 idf值以log10计算。) 在s1中,a的tf值等于____, b的tf值等于____, c的tf值等于____. 在s2中,a的tf值等于____, b的tf值等于____, c的tf值等于...