面对严峻的人口、资源、环境形势，我国必须走可持续发展之路。

在保险合同中，投保人对保险标的所享有的保险利益在经济上用货币估计的价值额被称为______。

A．保险价值
B．保险金额
C．预期价值 D．实际利益

下列可反映强度的指标是

A．率

B．相对比

C．构成比

D．频数

E．变异系数

小儿急性喉炎最危险的症状（）

A.喉水肿呼吸道梗阻

B.咽痛

C.声音嘶哑

D.发热

E.咳嗽

WebSQL is a SQL-like (76) language for extracting information from the web. Its capabilities for performing navigation of web (77) make it a useful tool for automating several web-related tasks that require the systematic processing of either ail the finks in a (78) , all the pages that can be reached from a given URL through (79) that match a pattern, or a combination of both. WebSQL also provides transparent access to index servers that can be queried via the Common (80) Interface.

A．hypertext

B．page

C．protocol

D．operation

从原理上讲，液压泵与液压马达具有（）。

A.不同性

B.相同性

C.可逆性

D.不可逆性