题目内容

回溯法搜索解空间树时，常用的两种剪枝函数为____

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Listen carefully and choose the word you hear.

A. vision
B. region

Listen carefully and choose the consonant you hear.

A. /j/
B. /dʒ/
C. /ʒ/
D. /tʃ/

Which of the following letter or letter group can be pronounced as / tʃ /?

A. sh
B. ch
C. tch
D. gh

Both /tʃ/ and /dʒ/ are unvoiced.

A. 对
B. 错