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【单选题】
A 可使从动杆得到较大的行程。A.
凸轮机构
B.
移动凸轮机构
C.
圆柱凸轮机构
D.
以上均不对
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反馈参考答案：
举一反三
【单选题】人体组织对X线的衰减,由大变小的顺序是
A.
骨、脂肪、肌肉、空气
B.
骨、肌肉、脂肪、空气
C.
脂肪、骨、肌肉、空气
D.
肌肉、骨、脂肪、空气
E.
肌肉、脂肪、骨、空气
【简答题】再次拍摄安全演示视频
【单选题】Questions 16 t0 19 are based on the passage you have just heard.
A.
He often teaches children what to do during a fire.
B.
He teaches Spanish in a San Francisco community.
C.
He provides oxygen masks to children free of charge.
D.
He travels all over America to help put out fires.
【简答题】语言与言语 名词解释
【单选题】Questions 16 to 18 are based on the passage you have just heard
A.
measure the speed of wind.
B.
give warnings of danger.
C.
pass on secret messages.
D.
carry ropes across rivers.
【简答题】副语言 名词解释
【简答题】名词解释: 注释语句
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