gaokao 2019 Q3

gaokao · China · national-II-science 5 marks Vectors Introduction & 2D Dot Product Computation
Given $\overrightarrow { A B } = ( 2,3 ) , \overrightarrow { A C } = ( 3 , t ) , | \overrightarrow { B C } | = 1$, then $\overrightarrow { A B } \cdot \overrightarrow { B C } =$
A． - 3
B． - 2
C． 2
D． 3 
Given $\overrightarrow { A B } = ( 2,3 ) , \overrightarrow { A C } = ( 3 , t ) , | \overrightarrow { B C } | = 1$, then $\overrightarrow { A B } \cdot \overrightarrow { B C } =$

A． - 3

B． - 2

C． 2

D． 3
Paper Questions
Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9