搜题请搜索小程序“爱下问搜题”
问题 单项选择题

下列各项，不属低钾血症表现的是

A．肌无力

B．频发室性期前收缩

C．血气分析pH低于正常

D．代谢性碱中毒

E．嗜睡

答案

参考答案：C

解析：缺钾性低钾血症主要表现有①骨骼肌表现(疲乏、软弱、乏力、腱反射减弱或消失、呼吸困难、吞咽困难等)。②消化系统表现(恶心、呕吐、厌食、腹胀、便秘、肠蠕动减弱或消失、肠麻痹等)。③中枢神经系统表现(萎靡不振、反应迟钝、定向力障碍、嗜睡或昏迷)。④循环系统表现(心动过速，可有房性、室性期前收缩；低钾性心肌病，心肌坏死、纤维化)。⑤泌尿系统表现(口渴多饮和夜尿多；失钾性肾病等)。⑥酸碱平衡紊乱表现(代谢性碱中毒、细胞内酸中毒及反常性酸性尿)。 [考点] 水、电解质代谢和酸碱平衡失常。

单项选择题

Questions 61-70 are based on the following passage.


While some international couriers are showing signs of exhaustion, EMS (Express Mail Service), the generic name for the courier services of post offices, seems to be finding its stride. Known as Datapost in Britain, as Chronopost in France, and as A1-Barid al-Mumtaz in Saudi Arabia, EMS is now second in the international courier business (jointly with TNT Skypack). Last year it delivered 5.6 million items, weighing less than 20 kilograms each, across borders. That and its annual growth rate of around 5 percent have worried DHL, the market leader, enough for it to counter-attack in the Courts.
On October 26, a Dutch judge ruled against DHL on all three counts filed against the Dutch post office: that the three-initial name was too close to DHL’s; that the orange lines in the EMS logo were too similar to DHL’s dark red ones; and that the claim to the widest route system in the world was unfounded. DHL has threatened the Swiss post office with similar action, but it may reconsider after the Dutch ruling.
EMS has some advantages over the private couriers. One is a dense ready-made network of offices, especially in Europe, the avowed target area of the private couriers. Another advantage is a long tradition of working with customs authorities. In a business where minutes count, it pays to have good friends at customs. That advantage particularly irritates the private couriers because there is no legal way to combat such unquantifiable coziness.
The private courier services are also annoyed because in countries like Switzerland and Italy, where the post office is officially a monopoly, they pay it a fee. In Switzerland DHL says it pays more than SFr lm ($ 708,000) "to the competition" each year. In France the couriers have won a battle for exoneration.
Although governments are under little pressure to keep prices artificially low, EMS is often cheaper than the private couriers, but not always. A recent test in Britain (on a domestic route) showed Datapost about halfway between the least and the most expensive, but gave it full marks for speed and service.
Each national EMS is free to set its rates and follow its own rules on things like bulk discounts. The Universal Postal Union, based in Berne, determines how costs and revenues are split between sending and receiving countries, and standardizes procedures. More than 100 postal administrations have linked into the system—and more are coming, including Russia’s. That makes the feisty EMS particularly happy since its rivals have not been allowed to serve anywhere in Russia.

Which of the following is true of DHL according to the passage

A. It cooperates with TNT Skypack.
B. It is showing signs of exhaustion.
C. It might have a leading position in the international courier business.
D. It has an annual growth rate of 5%.
查看答案
填空题

省煤器是利用排烟余热加热给水的受热面。其作用有（1）（），（2）（）。
查看答案