— __________.
— That`s OK.
[ ]
A. How are you?
B. Thanks a lot
C. What`s this?
答案:B
下列物质中,属于纯净物的是( )
A.海水
B.金刚石
C.天然气
D.食醋
腹膜后器官有:①胰腺;②小肠;③双肾;④肝()
A.①+②
B.①+②+③
C.②+③
D.①+③