随着压力的升高，饱和水与干饱和蒸汽的密度差将（）。
A.越来越大
B.越来越小
C.先增加后减小
D.先减小后增加
参考答案：B
看图完成对话，在横线上填入适当的词、短语或句子。
A: ___1___. Is there a post office near here?
B: Yes. ____2_ __ New Street and turn right on Bridge Street. You pass a library ___3_ your
right. The post office is_ __4___the restaurant and it is next to the supermarket.
A: Thank you very much. Goodbye.
B: ___5___ . Bye-bye.
电气设备发生火灾主要原因有哪些。
