国际战略联盟具有如下特点（）。A、对各方对资源和能力的贡献不严格的规定 B、政治风险

二尖瓣关闭不全时下列哪一项不属于其体征()

A．心尖搏动向左下移位，较局限

B．心尖搏动常呈抬举性

C．心浊音区向左下扩大，后期亦可向右扩大

D．心尖部第一心音增强

E．心尖部有3/6级或以上较粗糙的吹风样全收缩期杂音，向左腋部传导

小儿急性化脓性血源性骨髓炎可引起邻近关节化脓性关节炎的是

2011年6月，某医疗机构执业医师石某出于医学治疗的需要，切除了疾病患者丁某的人体器官，但最终并未控制住丁某的病情，致其死亡。石某的行为不构成犯罪。

试带法尿比密膜块的主要成分是（）

A.亚硝基铁氰化钠

B.吲哚酚酯

C.多聚电解质

D.碘化钾

E.邻联甲苯胺

Personal computers are used by one person at a time. The largest personal computer, or PC.S, can fit on a (1) . Some of these (2) have more than one microprocessor. (3) the primary processor, which is a general-purpose device, a PC may have one or more processors to (4) special kinds of work. Some machines, (5) , have maths processors, others have graphics processors to help process photographs and other illustrations. Still others have (6) processors.

Office workers also use PCS that are not (7) to a network. These machines are used for (8) tasks as word processing, performing financial calculations, and organizing and (9) bodies of information called databases. People use PCS at (10) for some of the same kinds of tasks. They use word processing programs for (11) communication, financial software for household budgets. Individuals also use their home computers to play (12) and to communicate (13) the internet.

Small, portable PCS are (14) with people who often work away from their desks. The (15) include laptop computers, which can be (16) on the lap; notebook computers, which are about the (17) of a loose leaf notebook; and palmtop, or handheld computers, which can be operated while (18) in the hand. Laptop and notebook computers have the same (19) as desktop computers. Palmtop computers have less power but still (20) some advanced capabilities. For example, they can process household financial data.

13（）

A. in

B. across

C. over

D. above