题目内容
施工企业的施工现场消防安全责任人应是（）A．施工企业负责人B．专职安全员C .一专职消防安全员D .项目负责人
查看答案
搜索结果不匹配？点我反馈
更多问题
A model built by engineers at Beepcard in Santa Monica，California，represents the first attempt to pack a microphone。a loudspeaker，a battery and a voice•recognition chip into a standard.sized credit card.
They are not quite there yet：the card is the length and width of an ordinary credit card，but it is still about three times as thick.The company now plans to make it thinner.
The voice card is based on an earlier Beepcard technology designed to prevent fraud in online transactions This earlier card has no microphone，but has a built•in loudspeaker that it uses to“squawk”(发出叫声)a voice ID signal via a computer’s microphone to an online server.
By verifying(证实)that the signal matches the card details，the server can establish that the user is not simply keying in a credit card number but actually has the card to hand.The ID code changes each time the card is used in a pre—ordered sequence that only the server knows.
This prevents fraudsters recording the beeps，noting the card details and then playing back the audible ID when they key in the details later But this earlier technology cannot prevent fraudulent use of stolen cards The new one can.
The new voice card also identifies itself by its ID squawk.but it will not do this until it has verified the legitimate(合法的)user’s spoken password Thieves will be unable to use the card because even if they knew the password they would have to be able to copy the owner’s voice with a high degree of accuracy.
The challenge for Beepcard has been to develop voice-recognition and audio circuitry that can be powered by a mini battery embedded(嵌入的)in a credit card.To maximize battery life，the electronics are only switched on when the card is being used.Pressing a button on the card’s surface prompts it to utter “Say your password ”in female voice If the voice—recognition software proves that the password is authentic(真实的)，it sends its ID squawk which the server then identifies.allowing the transaction to proceed.
第6题：The voice credit card is an important invention because
A．with B．as C．form D．beside
A．informeD． B．involveD． C．collecteD． D．caught
Who brought the Frenchmen\'s neckwear to Britain？
微信支付 
支付宝支付