当过梁跨度不大于1.2m时，可采用砖砌平拱过梁。

网络营销中，常使用在线调查表进行市场调查。下面不属于在线调查表设计中应注意的问题是( )。

A．明确提问的意思和范围
B．问题设计应详细复杂
C．所提问题不应有偏见或误导和不要诱导人们回答
D．避免引起人们反感或难以回答的问题

主动脉夹层DeBakey分型，Ⅰ型_________________________，Ⅱ型_________________________，Ⅲ型_____________________。

(病例串型最佳选择题，2～3个题共用题干)

患者在进行脑复苏时进行了以下处理，哪项不妥：

A．降温

B．用20%甘露醇

C．给地塞米松

D．给能量合剂

E．头低位

便后肛门坠胀，有异物感，检查时可见肛缘环形隆起，呈青紫色、光滑，初步诊断是：

A．血栓外痔

B．结缔组织外痔

C．炎性外痔

D．内痔脱出

E．静脉曲张性外痔

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.

19（）

A.processor 

B.power 

C.usage 

D.palm