函数f(x)=x+2的零点是( )
A.1
B.-2
C.3
D.4
解;由f(x)=x=2=0可得x=-2
故选B
When he was young, he used to hard at his lessons.
A.devote to working
B.devote himself to work
C.be devoted to work
D.be devoted to working
甘遂内服时用量是()
A.0.01~0.05g
B.0.5~1g
C.2~6g
D.10~15g
E.30~60g