2. 考研
  3. Automatons are mechanical objects that become relatively self-operating once they have been________.

Automatons are mechanical objects that become relatively self-operating once they have been________.

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问题 Automatons are mechanical objects that become relatively self-operating once they have been________.
选项 A、timed
B、actuated
C、maintained
D、serviced
答案B
解析 本题考查动词词义辨析。time作动词，意为“为……安排时间、测量……所需的时间”；actuate意为“开动(机器、装置等)、驱使”；maintain意为“维持、保持”；service意为“检修、维修，服务”。根据self-operating(自主操作)可知，其描述机器启动后的状态，故答案为B项。
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