【判断题】气瓶使用时,严禁敲击、碰撞,特别是乙炔瓶不应遭受剧烈振动或撞击,以免填料下沉而形成净空间影响乙炔的贮存。A. 对 B. 错
【判断题】When writing a business email, it's ok to leave the subject line blank.
【判断题】滑差电压经整流滤波电路处理后得到的滑差电压包络线即正弦整步电压。
【判断题】Leave a double space between the subject line and the body of the memo.
【判断题】You need to leave enough time for tax refunds in case of waiting in line.
【单选题】实验室出口、走廊是安全通道,任何时候应保持畅通。实验室配置的()、消防砂、消防水带等供消防使用,任何部门或个人不能随便移动或挪作它用。
【单选题】The word 'emphasize' in line 19 is closest in meaning to