The dangerous semicircle of a hurricane in the Northern Hemisphere is that area of the storm （）.
A. to the right of the storm's track
B. measured from true north clockwise to 180°T
C. measured from true north counterclockwise to 180°T
D. between the ship's heading and the bearing to the eye
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重复使用的诊疗器械被下列哪些病原体污染时应先消毒，后清洗、灭菌（）。
A. 乙型肝炎病毒
B. 朊毒体
C. 气性坏疽
D. 突发不明原因的病原体
E. 流感病毒
抽油机“五率”其中之一的内容是指抽油机（）水平率。
A. 游梁
B. 基础
C. 驴头
D. 井口
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