【简答题】若A为n阶方阵,则线性方程组Ax=0只有零解的充要条件是A的行列式 ; 有非零解的充要条件是A的行列式 .
【单选题】某饱和土样含水率为 29.7% ,塑限为 27.5% ,液限为 42.1% 。问该土样于( )状态。
【单选题】编辑word文档时,下列叙述正确的是( )。
A.
选定文字后,执行“剪切”操作,则这些文字会被删除
B.
要删除选中的文本,按Del 键与按backspace 键作用是不一样的
【单选题】听力原文:Woman: I want to watch TV and improve my English. What is your favorite TV show? Man: I like sitcoms. (8[A]) I watch 'Friends' a lot. I never missed a single episode. Of course there are other si...
【单选题】听力原文:W: I want to watch TV and improve my English. What is your favorite TV show? M: I like sitcoms. I watch 'Friends' a lot. I never missed a single episode. Of course there are other sitcoms like 'W...
【多选题】What save-money tips are offered according to the video?
B.
pay yourself 10% of your income
C.
write a shopping list and stick to it
E.
earn more instead of save more
【单选题】编辑Word文档时,下列叙述正确的是( )
C.
要删除选中的文本,按Del键与按BackSpace键作用是不一样的
D.
选定文字后,执行“剪切”操作,则这些文字会被删除
【单选题】编辑Word档时,下列叙述正确的是( )。
C.
选定文字后,执行“剪切”操作,则这些文字会被删除
D.
要删除选中的文本,按Del键与Backspace键作用是不一样的