甲、乙两台PC机通过其串行接口进行全双工通信时，若使用发送数据信号TxD和接收数据信

药物不良反应人群分布特征（）。

A.女性高于男性

B.男性高于女性

C.男女性别发生率无显著差异

D.50岁以上年龄组少于50岁以下年龄组

E.50岁以上年龄组多于50岁以下年龄组

病猪精神沉郁，咳嗽、消瘦，贫血，呼吸困难，被毛粗乱无光泽，在头、胸下和四肢发生水肿，曾先后使用过黄金一号、一针退烧等药物进行预防和治疗，效果不佳。猪群感染虫体后的第一症状是咳嗽，驱赶和夜间休息、早晨出圈时咳嗽更为明显，听诊肺部有湿性啰音。剖检发现支气管中有脓性黏液和混有血丝的分泌物团块，其中混有细小白色的虫体，虫体长1～5cm不等。该病最有可能是（）

A.肺丝虫病

B.结节虫病

C.圆线虫病

D.鞭虫病

下列选项中，属于公共服务主要内容的有（）。

A.档案管理

B.客户管理

C.环境管理

D.社会福利管理

E.房屋及设施设备管理

半夏白术天麻汤主治匪的病机是

A．阳虚阴盛，水饮内停

B．实热老痰，上蒙清窍

C．胆胃不和，痰浊内扰

D．脾湿生痰，风痰上扰

E．邪热内陷，痰热结胸

It is possibly the most famous promise in British retailing: "Never knowingly undersold" has been at the heart of John Lewis’s business since 1925. But a quietly introduced change has infuriated loyal customers, who claim the price-match promise is now slipping away. For many years John Lewis customers have been safe in the knowledge that if they found their purchase for a lower price elsewhere the company would refund the difference. Carrier bags and marketing campaigns have proudly proclaimed to the world that John Lewis won’t be beaten on price.
Yet since September some customers who have asked John Lewis to match the price of goods found cheaper elsewhere on the high street have been turned away. A Guardian Money reader from Roydon, Essex, contacted us after he bought a Hotpoint washing machine in John Lewis’s Welwyn store for ￡279. A few days later he saw the same model in Argos for ￡219--￡60 cheaper. John Lewis turned down his claim made under the never knowingly undersold policy, because it said it guaranteed the washing machines for two years, while Argos offered only one year.
The customer complained--unsuccessfully--that the store wasn’t being fair as this was not made clear in the literature. When Money investigated, we found that John Lewis had made a fundamental change to its policy. In a statement in September, which at the time drew positive headlines, it said it would for the first time match online prices from other retailers as long as they also had a physical high street presence. What was made less clear was that the store would no longer match a price unless its rival offers the exact same warranty.
The policy change might not sound much, but it in effect allows the store to avoid almost all price matching of electrical items--because John Lewis has adopted a policy of offering two-year warranties on almost every such item. Most stores in the UK offer just one year. When we first raised the reader’s complaint with John Lewis it told us. "As part of our commitment to be never knowingly undersold, we match prices based on the combined cost of the product plus charges the competitor may make for a comparable warranty or guarantee. We evaluate price-match claims on a like-for-like basis, and breakdown cover is a crucial part of our proposition to our customers. "
What it failed to mention was that prior to the September policy rewrite, it would have paid the complainant the ￡60 difference between the John Lewis and Argos washing machines. Interestingly, the store confirmed it would not price match the cost of buying a product plus a warranty from a third party company, but would consider a claim if the cheaper retailer offered the chance to buy both together.
David Suddock, head of buying support at John Lewis, who revised the policy, says. "As a result of our commitment to expand our never knowingly undersold policy to include other retailers with online presences we now put a great deal of resources into checking the prices charged by our rivals and lowering ours where appropriate; Our customers are benefiting through significantly reduced prices. They tell us they value the extra warranty periods we offer, and we think it is only fair we should include that in our price match scheme. The terms of the never knowingly undersold policy are clearly presented in both our stores and on the website. "
But if the Money postbag is to be believed, most John Lewis customers were unaware of the change. And Martyn Hocking, editor of Which says: "John Lewis is known for its great customer service, so the change to its never knowingly undersold policy is very disappointing. Customers would naturally expect any price matching policy to relate to the up-front cost of a product, excluding the value of added extras such as warranties and guarantees. As such, we feel that the amended policy is misleading and will lead to frustration for many shoppers. "
But Natalie Berg, research director at retail analysts Planet Retail, says John Lewis\s move was perhaps inevitable. "The internet has put the power to compare prices in the hands of all of us; some shoppers now use smart phones to check prices as they walk around a store. John Lewis has realized that while price is important, it’s not the factor in where to buy. The fact that John Lewis has been one of the winners on the high street in recent months suggests consumers are not just looking for the lowest prices, but they want value--and the perception that John Lewis delivers this. \

The editor of Which Martyn Hocking______.

A. openly exposes the tricks made by John Lewis
B. points out that customers should be informed of John Lewis’s amended policy
C. ply opposes David Suddock’s defence of and argument over the revised policy
D. makes an analytical criticism of John Lewis’s revised policy