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勒克斯（Lx）是（ ）的单位
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为了提高限定区域或目标的照度，使其比周围亮的光照形式是（ ）
Supply the missing information according to the story.It is a __________1__________ day. Bill Porter stopped at the first house. He ___2___ the bell. A woman comes to the door and refuses him by an ___3___. The person in the second house even doesn’t give him a chance to speak. For ninety minutes, Porter hasn’t made a __4__, but he doesn’t _____5_____. At last a woman is ____6_____ to buy a cake of soap from him.
根据汉语写出其对应的英文缩略词。1. 光盘 _____________2. 联合国 _____________3.毫升 _____________4. 电视 _____________5. (美国）全国篮球协会 _____________
心力衰竭最常见的诱因是()
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