[单选] Floating, caused by winds and current with a determinable direction defines（）.
A . floating B . sailing C . drifting D . running into danger
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简述反渗透R/O膜自动起、停的动作过程。
代理罪犯刑事申诉的律师会见罪犯有哪些规定？
简述反渗透高压泵联锁保护的动作过程。
新闻型公关活动
Floating, caused by winds and current with a determinable direction defines（）.
