已知命题:,则          A.               B.    C.    

已知命题,则      

   A.               B.

   C.               D.   

答案

C

相关题目

图12-2-9(a)表示一列简谐波在介质中传播时,某一质点a的振
图12-2-9(a)表示一列简谐波在介质中传播时,某一质点a的振动图象,请你在(b)图中作出这列简谐波在t=0时刻的波形图(质点a画在坐标原点上). 图12
—How long have you known the doctor ? —         he helped me three
—How long have you known the doctor ? —         he helped me three years ago.A.When B.Before C.BecauseD.Since
   Some researchers, parents and teachers have suggested that high-school cla
   Some researchers, parents and teachers have suggested that high-school classes begin later in the morning to accommodate (适应) teens’ needs for more sleep.    31   However, in the m
能促进细胞的分裂和生长,使枝叶长得繁茂的无机盐是   A.
能促进细胞的分裂和生长,使枝叶长得繁茂的无机盐是   A.含氮的无机盐                      B.含磷的无机盐     C.含钾的无机盐  
放牧强度可影响人工草地的物质循环和能量流动。图1是亚热
放牧强度可影响人工草地的物质循环和能量流动。图1是亚热带某人工草地在不同放牧强度下牧草净光合产量(净光合产量=光合作用合成量—呼吸作用消
Every eye ________________(注视) the new girl when she entered the classro
Every eye ________________(注视) the new girl when she entered the classroom. (fix)  
She saw a brook with red flowers and green grass on all sides.         
She saw a brook with red flowers and green grass on all sides.             A          B           C              D
 More than one-third of the Chinese in the United States live in California, _
 More than one-third of the Chinese in the United States live in California, _____ in San Francisco. A. previously    B. predominantly    C practically     D. permanently

最新题目