【单项选择题】
这些舱盖通常是用电力或液压驱动的。（）
A、A. These hatches are usually driven by electric or hydraulic power.
B、B. These hatch covers are usually driven by electric or hydraulic power.
C、C. These hatch covers are usually driven by electric.
D、D. These hatch covers are usually driven by hydraulic power.
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