The U.S. Army Apache helicopter fleet is to be equipped with the DuraTherm ice protection system as part of the Block III upgrade program.
美军阿帕奇直升机将配备DuraTherm冰保护系统作为BlockIII升级计划的一部分。
Its features of rapids in high level block sailing of ten thousand ton fleet in the period of low level.
铜锣峡是三峡库区回水变动段内典型的峡谷河段，其洪水急流滩特性阻碍了万吨船队在水位消落期的顺利航行。
Its features of rapids in high level block sailing of ten thousand ton fleet in the period of low level.
铜锣峡是三峡库区回水变动段内典型的峡谷河段，其洪水急流滩特性阻碍了万吨船队在水位消落期的顺利航行。
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