河道整治建筑物一般为永久性、非淹没式,主要用石料修建而成,常用丁坝、垛和平顺护岸,建筑物结构为堆石坝、干砌石坝、浆砌石坝。
参考答案:对
下列有关命题的说法中错误的是( )
A.若p∧q为假命题,则p,q均为假命题
B.命题“若x2-3x+2=0,则x=1“的逆否命题为:“若x≠1则x2-3x+2≠0”
C.若命题p:∃x∈R,使得x2+x+1<0,则¬p:∀x∈R均有x2+x+1≥0
D.“x=1”是“x2-3x+2=0”的充分不必要条件
_________ other good students, the teacher thinks, Hank is __________ student.
A.Compared with, a most satisfied
B.Compared to, the most satisfied
C.Compared with, a more satisfying
D.Comparing to, the most satisfying