液化石油气气态时的比重为().
A、1.17kg/m3
B、1.8-2.5kg/m3
C、1.43kg/m3
参考答案:B
You should read the ____________ in the car repair manual (手册) carefully before you start to work on it.
A.instruction
B.introductions
C.instructions
D.explanations
()是制定其他价格的基础和依据。
A.成本水价
B.理论价格
C.生产水价
D.目标水价