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毎日1問、正解者には6つの富を報酬として、参加者には2つの富を報酬として与えます;10月09日

2016-10-09View Original

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単一選択問題:ジャッキを使用する際、平らで固い地面の上に置き、その下に枕木や木板、または鋼板を敷く目的は( )です。A.ジャッキの持ち上げ力を強化する B.圧縮面積を広げて崩壊を防ぐ C.圧縮面積を狭める D.ジャッキの押し上げ高さを大きくする 正解:B
Reply #22016-10-09
B.圧迫面積を拡大し、崩壊を防ぐ

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