Fleischmann H0 - 111971 - Steam locomotive with tender (1) - BR 18 504 - for Marklin - Digital Sound - DRG 出价倒计时: 起拍价: EUR590 预估报价:EUR690 ~ EUR720 选择报价: EUR 服务费:境外拍卖行佣金(35%) 拍库平台服务费(10%) 合计金额: EUR870 (约合人民币:￥7160.01元) ...
Märklin H0 - 3776 - Train unit (1) - BR 610 'Pendolino' Full sound MFX - DB 出价倒计时: 起拍价: EUR550 预估报价:EUR560 ~ EUR610 选择报价: EUR 服务费:境外拍卖行佣金(35%) 拍库平台服务费(10%) 合计金额: EUR870 (约合人民币:￥7160.01元) ...
FIELD: physics.;SUBSTANCE: sound-proof acoustic protection contains profiled and perforated walls with a layer of sound-proof material arranged there between, one of the walls being made smooth and the said sound-proof material being arranged in two layers. Note that one of the said layers, mo...
PURPOSE:To analyze noises by simulation by computing a sound pressure level according to wall data to be varied, finding the difference from or ratio to a computed value in a reference chamber, and adding the calculated value to the measured value in the reference value or multiplying them. CO...
An underwater sound source with a remote controlled actuator comprising a oy having a buoyant portion, a plurality of launch tubes storing acoustic charges, a radio transceiver, control circuitry, hinged doors at the bottom of the tubes, and a safety release circuit. The hinged doors are ...