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单选题
Moving parts of machines and motor vehicles have to be _____ regularly to reduce friction.
A
lubricated
B
fabricated
C
embedded
D
dictated
参考答案
参考解析
解析：
句意：机器和机动车的运动零件要定期润滑以减少摩擦。lubricate润滑。fabricate编造。embed镶嵌。dictate口述。
句意：机器和机动车的运动零件要定期润滑以减少摩擦。lubricate润滑。fabricate编造。embed镶嵌。dictate口述。
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