处于
如图所示,在一光滑水平桌面上,固定放置一长直载流导线AB;在其一侧放一载流矩形线框CDEF,线框一边CD与长直载流导线平行.则线框受磁力作用而产生的加速度的方向为( ).
如图所示,在一光滑水平桌面上,固定放置一长直载流导线AB;在其一侧放一载流矩形线框CDEF,线框一边CD与长直载流导线平行.则线框受磁力作用而产生的加速度的方向为( ).
What is the main idea of this passage?
What is the main idea of this passage?
Kathy can’t think clearly when she is not under _____.
Kathy can’t think clearly when she is not under \_\_\_\__.
配制FeCl2溶液时,既要加____,其作用是____;又要加____,其作用是____.
配制FeCl2溶液时,既要加\_\_\_\_,其作用是\_\_\_\_;又要加\_\_\_\_,其作用是\_\_\_\_.