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【单选题】
数控机床的F功能常用单位是（ ）A.
m/min
B.
mm/min或mm/r
C.
m/r
D.
r/s或r/min
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【单选题】Jim, the newly elected director, had to reorganize the entire office he angrily complained of his ______, who had been so incompetent that everything was left in a mess.
A.
successor
B.
ancestor
C.
predecessor
D.
forefather
【单选题】Jim, the newly elected director, had to reorganize the entire office; he angrily complained of his _________, who had been so incompetent that everything was left in a mess.
A.
successor
B.
ancestor
C.
predecessor
D.
forerunner
【单选题】The school's system of serving lunch needs ______ . It is too slow .
A.
to reorganize
B.
reorganized
C.
being reorganized
D.
reorganizing
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