题目内容
一水平放置的双伸出杆液压缸，采用三位四通电磁换向阀，要求阀处于中位时能实现差动连接，其中位机能应选用。
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液压控制阀按功能可分为三大类，它们是( )。
Decide whether the following statements are True or False.F.P.A. covers total loss of the insured cargo, partial loss of or damage to the cargo answerable only where the carrying vessel is grounded, sunk or burnt.
F.P.A. does not cover the partial loss of the insured goods or the particular average by the natural calamities.
F.P.A. covers partial losses of the insured goods caused by heavy weather, lightning, tsunami, earthquake and/or flood.
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