知道六角螺母对边高度内孔怎么算他的重量六角螺母的对边和高度和内孔怎么不通过天枰 ,用计算机算出他的重量.最好用公式的方法,用准确的数列出来~_百度作业帮
知道六角螺母对边高度内孔怎么算他的重量六角螺母的对边和高度和内孔怎么不通过天枰 ,用计算机算出他的重量.最好用公式的方法,用准确的数列出来~
必须要知道他的材质啊,不同的材质密度都不一样的啊.
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型号：20毫米高 铜柱M3 六角铜柱
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External link. Please review our .Cosmic airburst debris, climate anomalies and societal reactions at 4.2kyr BP: f
Title:Cosmic airburst debris, climate anomalies and societal reactions at 4.2kyr BP: from North Syria to Adelie Land
Affiliation:AA(Archeorient, CNRS UMR 5133, Lyon, F ), AB(Prehistory, CNRS-MNHN UMR 7194, Paris, F )
Publication:American Geophysical Union, Fall Meeting 2012, abstract #PP21A-1973
Publication Date:12/2012
Keywords:0468 BIOGEOSCIENCES / Natural hazards, 0486 BIOGEOSCIENCES / Soils/pedology, 1605 GLOBAL CHANGE / Abrupt/rapid climate change, 6015 PLANETARY SCIENCES: COMETS AND SMALL BODIES / Dust
Bibliographic Code:
The linkages established between dust spikes, unprecedented drought and
societal disruption at 4.2 kyr BP have yet failed elucidating the marked
increase in aerosol. The volcanic dust component or the erratic spatial
pattern are among other puzzling anomalies for a global climate event.
We examine here the 4.2 kyr BP debris records from high quality
sedimentary archives across the two hemispheres: (1) at Tell Dja'de
(Syria), a carbonaceous surface sealed by a EB III/IV Bronze age
(2) at Tell Ahmar (Syria), the nearly intact collapsed wood
frame of the Akkad palace sandwiched between the last 3rd millennium BC
plastered floors and massive destruction layers of the monumental
(3) debris accumulation from human processed slags in late
Akkaddian contexts at Tell Leilan, Tell Chuera, Tell Beydar, Tell Brak
(North Syria) and in an EB III/IV one at Umbaschi (South Syria); (4) a
tsunami layer at Banda Aceh (Sumatra); (5) deep sea cores from the
Mediterranean and Caspian seas, the Indian and Austral oceans. Using an
in situ multi-analytical protocol, we focus on the carbonaceous
polymorphs and the composite elements that we formerly defined to
tracing hypervelocity cosmic airbursts. A meticulous control of their
spatial pattern and structural characteristics at meso to nano-scales
has helped to distinguishing the intact debris fall of airburst origin
from their human processed-byproducts. The later trace the occurrence in
the debris airbursts of highly valuable resources, i.e. fossil
combustible with singular properties, that have been exploited since the
prehistoric time. Evidence for an oceanic impact at 4.2 kyr BP in the
Austral ocean are provided by the 3 m record in the Adelie land high
resolution marine core (MD03-2601) showing sudden discharge of ice
rafted fine debris with impact features. Their fresh fingerprints in the
high to low latitude records from the southern hemisphere indicate
massive dispersion of impact debris by air and surface processes with
coastal devastation by tsunamis. The erratic spatial pattern of the
impact features in the 4.2 kyr BP dust layer across the northern
hemisphere allows to tracing local devastation at the ground by violent
airbursts, hailstorms and rainfall in response to the sudden atmospheric
loading by the oceanic ejecta with its distinctive fossil fuel
components. The imbrication of Austral marine microfossils with the
volcanic debris in the human-processed slags helps linking their
exceptional origin to impact airburst processes. The occurrence of the
impact debris with their Austral marine and volcanic components in the
wood frame of the collapsed Akkad palace at Tell Ahmar illustrates how
the violent debris airburst severely damaged the monumental buildings.
The strict contemporaneity of the EBIII/IV cemetery at Tell Dja'de with
the exceptional debris fall suggests to relating the reactivation of
ancestral funerary practices to the sudden profusion of the highly
valuable resources that have been lacking since the Early Pre-Pottery
Neolithic B.
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