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基于Web 2.0的Web应用十分强调用户的体验与感受，Ajax是目前广泛使用的表现层技术。请用200字以内的文字简要介绍Ajax的概念和核心思想，并说明在使用Ajax时，从效率方面考虑需要注意的问题(列举三个即可)。

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以下对急性化脓性胆管炎的概述中，错误的是

A. 胆管梗阻和胆管化脓性感染并存
B. 致病菌主要有大肠埃希菌、变形杆菌、产气杆菌等以及厌氧菌
C. 起病急骤，可发生感染性休克、并发急性肝肺肾衰竭
D. 白细胞、中性粒细胞及胆红素均升高，代谢性酸中毒，PaO2下降
E. 先保守治疗，病情稳定后择期手术

一般按运输工具不同分为机动车辆保险、飞机保险、()、其他运输工具保险。

One company, having moved to a new place, doubled the number of goods sold each quarter for all quarters.

Sheet.
MEMO
To: Jo Montenegro
From: Zhara Farrell
Date: 25 February 2002
Subject: Bob Young
One of the warehouse assistants, Bob Young, has broken his arm. Here is the letter from his doctor; please let Bob's line manager know how long he will be away, and fill in a sick pay form. for him.
24 February 2002
To whom it may concern
This is to inform. you that Mr B Young has a broken arm. He should not return to work for a fortnight.
Dr Jake Parry
Employee Sick Pay Form
Name of employee: (41)
Position (42)
Name of doctor: (43)
Reason for absence: (44)
Length of absence: (45) __
(41)