下列不属于化石燃料的是 [ ]
A．煤炭
B．石油
C．天然气
D．醋酸
D
She is planning on driving. Let's help her _____ some good ideas. [ ]
A. come out
B. come up
C. catch up with
D. come up with
DINI0.3在水准线路结果中，Db代表（）
A.高差总和
B.后视视距和
C.前视视距和
