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輪機(jī)英語(yǔ)船舶輔助機(jī)械單項(xiàng)選擇題每日一練(2019.01.12)
來(lái)源:考試資料網(wǎng)
1
For occasional heavy loads, two cranes can be arranged to work together. The operating () for deck crane motors may be hydraulic electric.
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2
Which of the valves listed is NOT considered to be a hydraulic system directional control valve?()
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3
External and internal leakage in hydraulic systems may be caused by ().
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4
Which of the following is operated from the main engine room console on an automated vessel?()
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5
The shaft and spare parts() should be well greased in order to avoid corrosion.
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