反弯点法各杆件弯矩为__，除底层外反弯点在__，底层在距柱底__处
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什么是电子商务会展？它具有哪些传统会展不可比拟的优点
WhatisanEGC“ENID”？（）
A. This identifies the vessel’s selective calling （selcall） number.
B. This number is used for receiving news and other optional services in FleetNET.
C. This is the INMARSAT number that is assigned to a unit for incoming calls.
D. This is the vessel’s INMARSAT registration number for accounting authority purposes
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