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问题:

[单选] Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?()

A . hydraulic pumps
B . valves
C . hydraulic cylinders
D . hydraulic motor

() are used to handle anchors and chains. Cargo winches。 Mooring winches。 Windlasses。 Cargo hatche。 渠道控制可以采取的方法有凭借强制性权利控制、()、依靠品牌控制、利用辅助销售控制、依靠激励手段控制。 形成热带地区树种的多样性高的机制是()。 环境异质性高。 植食动物和病原体对普通物种影响大。 中度干扰多。 树种竞争排除经历时间长。 The document on a vessel,annually endorsed by an American Bureau of Shipping surveyor,is called the(). Certificate of Inspection。 Classification Certificate。 Load Line Certificate。 Seaworthy Certificate。 简述怎样测量炭化室底部压力? Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?()
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