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- 单项选择题高速和野蛮操作舱盖均是危险的。()
A、High-speed operation and rough handling of hatches are dangerous.
B、Low-speed operation and rough handling of hatches are dangerous.
C、Low-speed operation and rough handling of hatch covers are dangerous.
D、High-speed operation and rough handling of hatch covers are dangerous.
- D
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