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【单选题】
錾子一般用优质碳素工具钢制成，刃口部分经（）处理。A.
淬火+退火
B.
淬火+调质
C.
淬火+回火
D.
表面淬火
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【简答题】Using Boolean notation, write an expression that is a 1 whenever one or more of its variables (A,B,C,and D) are 1s
【单选题】Using DeMorgan’s Law, write an expression for the complement of F if F(x,y,z) = xy + xz + yz. The correct one is:
A.
(x + y)(x + z)(x' + z)
B.
(x' + y')(y'+ z)(x' + z)
C.
(x' + y')(y'+ z')(x' + z)
D.
(x' + y')(y'+ z')(x' + z')
【简答题】write an expression that is a 1 only if all of its variables (A,B,C,and D) are 1s
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