判斷題

波音B777中用量最大的β鈦合金是Ti-10-2-3合金（）

答案：正確

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軸力以拉伸為正,以壓縮為

答案： ["負"]

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It hs beennnounced tht cndidtes remin in their sets untilll the ppers hve been collectedIt

hs beennnounced tht cndidtes remin in their sets untilll the ppers hve been collected.shll B．cn C．should D．mustA．shallB．canC．shoulD．must