The easiest way to anchor a vessel in a current is to().
A. stem the current and make very slow headway when the anchor is dropped
B. stem the current and be falling aft very slowly when the anchor is dropped
C. stem the current and endeavor to make neither headway nor sternway when the anchor is dropped
D. stop all headway through the water and keep the current astern when the anchor is dropped
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带电作业工具应置于(),备有红外线灯泡或()的清洁干燥的专用房间存放。
良性肿瘤一般称为()。恶性肿瘤来自上皮组织者称为(),来源于间叶组织者称为()。
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