试题详情
- 单项选择题We must grease and clean the derrick parts.()
A、我们必须给吊杆部件上大黄油并清洗。
B、我们必须马上给吊杆部件上大黄油并清洗。
C、我们应该给吊杆上大黄油并清洗。
D、我们不用给吊杆部件上大黄油并清洗。
- A
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