如图所示,在半径为R的圆形区域内,有一磁感应强度为B的向外的匀强磁场,一质量为,电量为的粒子(不计重力),从A点对着圆心方向垂直射入磁场,从C点飞出,速度方向改变了60°则 ( )
从A、B、C、D四个选项中找出其画线部分的读音与所给单词的画线部分读音相同的选项.
Germany( )
A.greenB.guestC.greatD.geography
The sentence pattern of "I enjoy living in Gansu." is________________. ( )
A.S+V+OB.S+V+PC.S+V+IO+DOD.S+V+DO+OC
Which of the following suffixes(后缀)means "without"?( )
A.﹣ableB.﹣fulC.﹣ousD.﹣less
﹣_______have you kept this book?
﹣For two months.( )
A.How soonB.How oldC.How longD.How often
I______sleep very well, but then I started doing yoga and it really helps.( )
A.didn't use toB.used to
C.was used toD.wasn't used to