【单选题】Every possible means_____ been tried,and we find only______ this means can we do it well.
【简答题】在平面直角坐标系中,矩形纸片ABCD的长为4,宽为2.AB,AD边分别在x轴、y轴的正半轴上,点A与坐标原点重合.将矩形纸片沿直线折叠,使点A落在边CD上,记为点A',如图所示. (1)设A'的坐标是(2a,2)(0≤a≤2),写出折痕所在直线的方程; (2)若折痕经过B时,求折痕所在直线的斜率,并写出以折痕为直径的圆方程.
【单选题】We have to ______ everything question in detail ______ we take action. [ ]
B.
make analysis of; when
【单选题】— We haven't done very well ,have we ? — At least we tried . [ ]
【简答题】课堂上老师提出这样一个问题:你能用手中的矩形纸片尽可能大的折出一个菱形吗?有两位同学很快折出了各自不同的菱形,如下甲、乙两图: (1)如果该矩形纸片的长为8,宽为6,则甲、乙两图中的菱形周长分别为:____,____(直接写出答案) (2)这时老师说,这两位同学折出的菱形周长都不是最大的,聪明的你能够想出最大的菱形应该怎样折出来吗?如丙图所示:在矩形ABCD中,设AB=6,AD=8,请你在图中画出...
【单选题】--We have tried our best.--You' d better give up, nowhere,______.
A.
the missing girl could be found.
B.
you will find the missing girl.
C.
could find the missing girl
D.
could the missing girl be found
【单选题】We judge others around us easily, but have we ever tried to figure out our own personality?
【单选题】市场经济对医学实践有负效应,主要是因为( )
【简答题】写出下列日语汉字的假名。 1、親子丼 2、お茶 3、卵 4、お弁当 5、野球 6、音楽 7、動物 8、雑誌 9、手紙 10、映画
【单选题】____ we have tried it, we can't imagine how hard it is. [ ]