题目内容
采用机器人自动焊接转角焊缝时应考虑焊枪平滑过渡产生内旋现象对电弧稳定性的影响。（）
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虽然半自动仰焊时，不利于熔滴过渡，焊工劳动强度大，但采用机器人自动化焊接没多大影响。（）
采用机器人焊接中厚板平角焊缝时，若两板厚度一样，则焊枪转角保持45°左右比较适宜。（）
采用机器人焊接中厚板平角焊缝时，焊枪倾角保持在90°左右比较适宜。（）
Chance favors the preparedBorn in a ____neighborhood, Les Brown was later ____by Mamie Brown. When the ____opportunities for his future looked slim to others, he still had great passion for his dream. He ____his friends with his constant practicing. They all scorned him but Les didn't let their ____stop him. One day Les decided to take the ____and boldly went to the manager of the local radio station to apply for a job. Being bluntly rejected, Les didn't give up though and returned to the station every day for a week. His ____was very persuasive, and the station manager finally gave in and took Les Brown to do small tasks--at no pay.While ____with the station's real DJs, Les taught himself their posture and hand movements on the control panel. When he stayed around the studio he ____whatever knowledge he could. One afternoon when the DJ named Rock was sick and none of the regular DJs were available, Les got his chance. Because of his ____, Les was ready. He had ____the audience and heard applause from his general manager. From that fateful beginning, Les was ____to become an icon in broadcasting, politics, public speaking and television.
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