在常温下,液化石油气液体单位体积的重量比水()
A、重
B、轻
C、差不多
D、不好比
参考答案:B
Before the storm,fishes in the pond usually________themselves out of the water to get fresh air.[ ]
A. throw
B. run
C. swim
D. escape
癫痫部分性发作分类有哪些