矿井安全监控系统在停电后，系统必须保证正常工作时间不小于（）。A、2小时 B、3小时

如图所示为AB两个导体的I-U图线，由图线可知

A．R_A>R_B

B．R_A<R_B

C．R_A＝R_B

D．无法确定

弯制磨牙卡环常用的钢丝规格是（）

A.18#

B.19#

C.20#

D.22#

E.23#

有一个物体重为4牛，挂在弹簧秤下浸没水中，示数为1牛，此物体受到的浮力为 _________ N，此物体的体积为_________m³，若浸没酒精中，受到的浮力为_________N．（ρ_酒=0.8×10³kg/m³）

关于社会组织的检验能力，下列说法错误的是（）

A.要及时做好对不符合目标的因素的善后工作

B.检验主要是指对组织时间结果的检验

C.及时提出不过负荷组织目标的因素

D.必须及时检验处组织内外有利于组织目标的因素

Rapid advances in computer and communication technologies have resulted in the (58) merger of these two fields. The lines have bluned among computing, switching, and digital transmission equipment, and the same digital techniques are being used for data, voice, and image transmission. Merging and evolving technologies, coupled with increasing demands for efficient and timely collection, processing, and (59) of information, are leading to the development of (60) that transmit and process all types of data. The ultimate goal of this evolution is something its proponents-some of the most powerful forces in the computing and telecommunications industries-call the (61) .The (61) will be a worldwide public telecommunications network that will deliver a wide variety of services. The (61) will be defined by the standardization of user interfaces, and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing (62) processing services. Inpractice, there will be multiple networks, implemented within national boundaries, but from the user’s point of view there will be a single, uniformly accessible worldwide network.

and will be implemented as a set of digital switches and paths supporting a broad range of traffic types and providing () processing services.

A．accessible

B．special

C．data

D．value-added