【单选题】下列用“ ”或“ ”“=”等符号表示两个集合关系错误的是
B.
{ x| x=4m ,m Z } {x| x=2m ,m Z}
D.
{x| x=2m-1 ,m Z} ={x| x=2m+1 ,m Z}
【单选题】Where in the tank shall the oxygen level be determined before crude oil washing
A.
1 meter from the deck and in the bottom of the tank
B.
in the middle of the tank
C.
1 meter from the deck and in the middle region of the ullage space
D.
2 meters from the deck and in the middle region of the ullage space
【单选题】下列用“ ”或“ ”“=”等符号表示两个集合关系错误的是
B.
{ x| x=4m ,m Z } {x| x=2m ,m Z}
D.
{x| x=2m-1 ,m Z} ={x| x=2m+1 ,m Z}
【单选题】在储蓄、国债、金融债券和企业债券这几种理财方式中,风险最小的是
【单选题】在储蓄、国债、金融债券和企业债券这几种理财方式中,风险最小的是( )