【多选题】选择一个合适的检验统计量是假设检验中必不可少的一个步骤,其中“合适”实质上是指( )
C.
在原假设为真时,所选的检验统计量的抽样分布已知;
D.
在备择假设为真时,所选的检验统计量的抽样分布已知;
E.
所选的检验统计量的抽样分布已知,不含未知参数。
【单选题】If you watch an impromptu performance of something, has it (a) been prepared, or (b) not been prepared?
B.
(b) not been prepared?
【判断题】声表面波滤波器的主要器件是叉指换能器。( )
【判断题】( ) 声表面滤波器的主要器件是叉指换能器。
【简答题】The cargo manifest is prepared by( ).
【单选题】—How many cakes can I have, Mum? —None, dear.They ________ for your father. er. A . prepare B . prepared C . have prepared D . were prepared
【判断题】声表面滤波器的主要器件是叉指换能器。( )
【单选题】Mother was in the kitchen ______ lunch while I was ______ the coming exam.
A.
prepared; prepared for
B.
preparing; preparing for
C.
prepared for; prepared
D.
preparing for; preparing
【单选题】精神症状不危害自己和他人,或仅有一般躯体疾病,生活尚能自理者应给与的护理级别是