以“平方米”为单位的工程量，应保留()位小数。A、1 B、2 C、3

已知NaHSO₄在水中的电离方程式为：NaHSO₄=Na⁺+H⁺+SO₄^2-。某温度下，向pH=6的蒸馏水中加入

NaHSO₄晶体，保持温度不变，测得溶液的pH为2．下列对该溶液的叙述中不正确的是[ ]

A．该温度高于25℃

B．由水电离出来的H⁺的浓度是1．0×10^-10mol·L^-1

C．NaHSO₄晶体的加入抑制了水的电离

D．该温度下加入等体积pH为12的NaOH溶液可使该溶液恰好呈中性

全脂奶粉在使用时，以______的比例稀释。

A．奶粉:水为1:9
B．奶粉:水为1:8
C．奶粉:水为1:7
D．奶粉:水为1:6
E．奶粉:水为1:5

设A=2，B=-2，则表达式A/2+1＞B+5 Or B*(-2)=6的值是______。

System analysis is traditionally done top-down using structured analysis based on (90) ．Object-oriented analysis focuses on creation of models．The three types of the analysis model are (91) ．There are two substages of object-oriented analysis． (92) focuses on real-world things whose semantics the application captures．The object constructed in the requirement analysis shows the (93) of the real-world system and organizes it into workable pieces． (94) addresses the computer aspects ofthe application that are visible to users．The objects are those which can be expected to vary from time to time quite rapidly．

A．static structure
B．system components
C．data flows
D．program procedures

弯曲菌感染有下列哪些临床表现（）

A.多数患者发热，脐周绞痛，腹泻，大便水样、黏液样

B.部分病例可出现多种并发症，如腹膜炎、多发性神经炎、心内膜炎等

C.胎儿弯曲菌感染亦可出现剧烈腹泻

D.胎儿弯曲菌具有侵袭力，进入血液循环引起败血症

E.妊娠中期感染，可引起死胎和流产