在《架空输电线路无人直升机巡检系统》中,无人直升机巡检系统的导航定位偏差水平方向不大于()
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After dinner, he often listens to music and __________ books.
A. see
B. watches
C. reads
D. looks
Tony is not so clever as Judy, but he works ______than she
A. hard
B. harder
C. hardest
D. the hardest
The plane ______ when we got to the airport.
A. had taken off
B. has taken off
C. will take off
D. is taking off
China is not ________ it used to be
A. that
B. how
C. whether
D. what