SOLAS vessels should be able to communicate with a shore station().
A. no matter where they are and what time it is
B. at scheduled time and in major ocean regions
C. at fixed time and position
D. when they get permissio
瓦伦西亚的世界遗产La Lonja是用来交易什么的古市场?()
A. 丝绸
B. 鱼
C. 香料
地表以下第一个含水层水面到地面之间的水,通常称为()。
A. 包气带水
B. 潜水
C. 承压水
D. 冲击水