某第4周期的元素,当该元素原子失去一个电子成为正1价离子时,该离子的价层电子排布式为3d10,则该元素的原子序数是:()
A.19
B.24
C.29
D.36
参考答案:C
复苏中提起下巴的目的是()
A.提起舌体
B.改善咽喉成角
C.保护咽部
D.防止颈椎损伤
E.防止牙齿咬伤舌
The dense Belgian fogs is caused by the cooling of humid surface air to a relatively low temperature.
A.must cause
B.will be caused
C.are caused
D.has been caused