单选(10分)Unfortunately, as history has shown, some of the companies are guilty of misconduct ________ profit.
A. go after
B. in the pursuit of
C. seek for
D. run after
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单选(10分)We see many special education directors trying to ________ the quality of their programs with much less money and much smaller staff.
A. hold
B. keep
C. maintain
D. promise
单选(10分) People there are told it is their ________ duty to support the national economy by buying their own products.
A. patriotic
B. patriotist
C. patriotism
D. patriot
已知逻辑函数Y=AB+A'C+B'C,试求与其相等的函数为()。
AB
B. AB+A'C
C. AB+B'C
D. AB+C
已知,F = (ABC+CD)',选出下列可以肯定使F=0的情况:( )
A=0, BC=1
B=1,C=1
C=1,D=0
D. BC=1,D=1