有明显胆汁返流的慢性胃炎者，首选的治疗药物是（） A.糖皮质激素 B.吗丁啉 C.硫

当物体到凸透镜的距离为______时，凸透镜不成像；当物体到凸透镜的距离为______时，凸透镜成等大的实像．

实验表明：电流具有磁效应，电流产生的磁场方向与______有关．通电螺线管的外部的磁场性质与______相似．

双风管集中式系统的特点主要有( )。

A．每个房间(或每个K)可分别控制

B．系统工作时，需用冷、热空气混合，室温调节反应较为迟钝

C．空调房间内无末端装置

D．空间房间内不出现水管、电气附属设备、过滤器等，对使用者无干扰

Communication technologies are far from equal when it comes to conveying the truth．The first study to compare honesty across a range of communications media has found that people are twice as likely to tell lies in phone conversations as they are in emails．The fact that emails are automatically recorded—and can come back to haunt（困扰） you—appears to be the key to the finding．

Jeff Hancock of Cornell University in Ithaca, New York, asked 30 students to keep a communications diary for a week．In it they noted the number of conversations or email exchanges they had lasting more than 10 minutes, and confessed to how many lies they told．Hancock then worked out the number of lies per conversation for each medium．He found that lies made up 14 percent of emails, 21 percent of instant messages, 27 percent of face-to-face interactions and an astonishing 37 percent of phone calls．

His results, to be presented at the conference on human-computer interaction in Vienna, Austria, in April, have surprised psychologists．Some expected emailers to be the biggest liars, reasoning that because deception makes people uncomfortable, the detachment（非直接接触） of emailing would make it easier to lie．Others expected people to lie more in face-to-face exchanges because we are most practiced at that form of communication．

But Hancock says it is also crucial whether a conversation is being recorded and could be reread, and whether it occurs in real time．People appear to be afraid to lie when they know the communication could later be used to hold them to account, he says．This is why fewer lies appear in email than on the phone．

People are also more likely to lie in real time—in an instant message or phone call, say—than if they have time to think of a response, says Hancock．He found many lies are spontaneous（脱口而出的） responses to an unexpected demand, such as: “Do you like my dress?”

Hancock hopes his research will help companies work out the best ways for their employees to communicate．For instance, the phone might be the best medium for sales where employees are encouraged to stretch the truth．But given his result, work assessment, where honesty is a priority, might be best done using email．

57．Hancock’s study focuses on ________．

A．the consequences of lying in various communications media

B．the success of communications technologies in conveying ideas

C．people’s preference in selecting communications technologies

D．people’s honesty levels across a range of communications media

58．Hancock’s research finding surprised those who believed that ________．

A．people are less likely to lie in instant messages

B．people are unlikely to lie in face-to-face interactions

C．people are most likely to lie in email communication

D．people are twice as likely to lie in phone conversations

59．According to the passage, why are people more likely to tell the truth through certain media of communication?

A．They are afraid of leaving behind traces of their lies

B．They believe that honesty is the best policy

C．They tend to be relaxed when using those media

D．They are most practiced at those forms of communication

60．According to Hancock, the telephone is a preferable medium for promoting sales because ________．

A．salesmen can talk directly to their customers

B．salesmen may feel less restrained to exaggerate

C．salesmen can impress customers as being trustworthy

D．salesmen may pass on instant messages effectively

2009年3月2日，A公司与B公司签订了一份100万元的设备买卖合同。该合同约定：
A公司于3月3日向B公司签发一张金额为人民币15万元的银行承兑汇票作为定金；B公司于3月10日交付设备；A公司于B公司交付展览设备之日起3日内付清货款；任何一方违约，应当依照合同金额的20%向守约方支付违约金。
3月3日，A公司向B公司签发了一张已由C银行承兑的金额为15万元的银行承兑汇票，B公司在收到该汇票后，于3月4日将其背书转让给D公司，D公司已经支付了对价。3月10日，B公司未向A公司交付设备，经A公司催告后至3月15日，B公司仍未交货，A公司遂于3月18日另行购买了设备，并通知B公司解除合同，要求B公司双倍返还定金30万元，同时支付违约金20万元。B公司收到A公司通知后未就解除合同提出异议，但不同意A公司提出的双倍返还定金和支付违约金的要求。
4月5日，D公司在该汇票到期日向C银行提示付款，C银行以买卖合同已经解除为由拒绝支付票据款。
2009年5月1日，A公司为更新改造生产设备向C银行贷款1500万元，借款期限为1年，A公司以自己的一套流水线提供抵押，另外，由甲公司为A公司的贷款提供保证，甲公司与C银行签订保证合同，但未明确约定保证的形式。双方约定的保证期间为“甲公司承担保证责任，直至A公司的本息还清时为止”。
2010年5月1日，A公司无法清偿上述C银行的贷款，C银行向甲公司要求清偿，甲公司以应先就A公司提供的流水线拍卖价款清偿，不足的部分再由自己承担。经查，A公司与C银行订立的抵押合同和甲公司与C银行订立的保证合同中，均未约定各自的担保份额和责任承担顺序。
要求：根据上述事实，结合合同法律制度的相关规定，回答下列问题：

A公司解除合同的主张是否符合《合同法》的规定并说明理由。