單項(xiàng)選擇題

It is now possible for business to operte effectively withoutn office, becuse the emIt is

now possible for business to operte effectively withoutn office, becuse the employees cn conductll communictions vi （）. phone B． voice mil C． fx D． e-milA．phoneB．voice mailC．faxD．e-mail

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判斷題

Business arrangement means every activity in business operation.（）

答案：錯(cuò)誤

問答題

下圖是教師在課堂中演示的兩個(gè)實(shí)驗(yàn)裝置（）實(shí)驗(yàn)二用來驗(yàn)證Na 2 O 2 與CO 2 的反應(yīng)，觀察到的實(shí)驗(yàn)現(xiàn)象是：包有Na 2 O 2 的棉花燃燒。從該實(shí)驗(yàn)可以得出許多結(jié)論，請你寫出由該實(shí)驗(yàn)得出的兩個(gè)結(jié)論：結(jié)論1：_；結(jié)論2：_

答案：（1）比較碳酸氫鈉和碳酸鈉的熱穩(wěn)定性；燒杯Ⅱ中產(chǎn)生白色沉淀，燒杯Ⅰ中無明顯現(xiàn)象； 2NaHCO 3 Na 2 CO 3 ...