乙烯常温常压下是()。
A、液体
B、气体
C、固体
D、汽液混合物
参考答案:B
一般热疗的有效温度为()。
A.45.5~48.0℃
B.42.5~45.0℃
C.40.5~42.0℃
D.37.5~38.0℃
E.36.5~37.0℃
— What are these?
— _____.[ ]
A. They are buses
B. These are buses
C. Yes, they are buses
D. Yes,these are buses