Once the ______ contradiction is grasped, all problems will be readily solved.
A. principle
B. principal
C. potential
D. primitive
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A considerable amount of time and money has been invested in ______ this system.
A. defining
B. implying
C. reducing
D. perfecting
On the first day when a pupil enters school, he is asked to ______ to the school rules.
A. concede
B. conform
C. comply
D. confront
夹板门内部要干燥，做透气孔贯穿上下框格，透气孔孔径一般为( )mm。
A. 5
B. 9
C. 15
D. 20
Which of the following is true of descriptive statistics
A. It leads to increased variability
B. It solves all numerical problems
C. It simplifies unwieldy masses of data
D. It changes qualitative variables to quantitative variables
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