信息战是敌我双方围绕对信息的感知能力、传输能力、处理能力和决断能力进行的对抗活动。()
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When the train __________ , all the school students were surprised to see that the Carlisle team had one man only.
A. pulled down
B. pulled on
C. pulled off
D. pulled in
You‘ll find this Travel Guide to be of great__________ in helping you and your children to
A. cost
B. price
C. value
D. expenditure
In English, the aspirated [ph] and the unaspirated [p] are__________.
A. minimal pairs
B. in phonemic contrast
C. two distinctive phonemes
D. in complementary distribution