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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。（）
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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.
分销渠道作用主要表现在（ ）
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