易自考离散数学试题第一部分 选择题 一、单项选择题1下列是两个命题变元p,q的小项是( C )AppqBpqCpqDppq2令p:今天下雪了,q:路滑,则命题“虽然今天下雪了,但是路不滑”可符号化为( D )ApqBpqCpqDpq3下列语句中是命题的只有( A )A1+1=10Bx+y=10Csinx+siny0Dx mod 3=24下列等值式不正确的是( C )A(x)A(x)AB(x)(BA(x)B(x)A(x)C(x)(A(x)B(x)(x)A(x)(x)B(x)D(x)(y)(A(x)B(y)(x)A(x)(y)B(y)5谓词公式(x)P(x,y)(x)(Q(x,z)(x)(y)R(x,y,z)中量词x的辖域是( C )A(x)Q(x,z)(x)(y)R(x,y,z)BQ