题目内容

大烟道有几块孔板,其作用是干什么?

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细胞中具有光合作用的细胞器是()。

A. 叶绿体
B. 高尔基体
C. 线粒体
D. 细胞核

信号电源电压不得大于()V,提升装置的直接供电线路上严禁分接其他负荷。

A. 127
B. 36
C. 220

Finally,when your ship is alongside,don’t forget().

A. having rat guards properly mounted on your moorings
B. to have rat guards properly mounted on your moorings
C. to have rat guards properly mounting at your moorings
D. having rat guards proper mounted on your mooring

对流层和平流层航空器的飞行环境是对流层和()。

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