题目内容

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

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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

在函数F=AB+C的真值表中，F=1的状态有（）个。

A. 2
B. 4
C. 5
D. 7