闸刀开关
参考答案:
闸刀开关是最简单的一种低压开关,额定电流可致1500安,只能手动操作,不能切断故障电流,主要用在不经常操作的交直流低压电路中。
A basic premise of OGSA is that everything is (71) by a service: a network enabled entity that (72) some capability through the exchange of messages. Computational resources, storage resources, networks, programs, databases, and so forth are all (73) . This adoption of a uniform service-oriented model means that all components of the environment are virtual. More specifically, OGSA represents everything as a Grid service: a Web service that conforms (74) a set of conventions and supports standard interfaces for such purposes as lifetime management. This core set of consistent interfaces, from which all Grid services are implemented, (75) the construction of hierarchical, higher-order services that can be treated in a uniform way across layers of abstraction.
(72)处填()。
A.provides
B.have
C.expands
D.limits
感性认识和理性认识统一的基础是( )。
A.真理 B.反映C.创造 D.社会实践