2. 考研
  3. Moving parts of machines and motor vehicles have to be ______ regularly to reduce friction.

Moving parts of machines and motor vehicles have to be ______ regularly to reduce friction.

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问题 Moving parts of machines and motor vehicles have to be ______ regularly to reduce friction.
选项 A、lubricated
B、fabricated
C、embedded
D、dictated
答案A
解析 该句意为：机器和机动车的运动零件要经常使用润滑油，以减少摩擦。lubricate：润滑；fabricate：编造；embed：镶嵌；dictate：口述。
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