A.干燥劑B.泡沫C.活性炭
A.AB.BC.CD.D
A.物理層-網(wǎng)絡層-數(shù)據(jù)鏈路層-傳輸層-應用層B.物理層-網(wǎng)絡層-數(shù)據(jù)鏈路層-應用層-傳輸層C.物理層-數(shù)據(jù)鏈路層-網(wǎng)絡層-傳輸層-應用層