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内因论者更强调个体发展的[ ]和内部矛盾在心理发展中的作用,认为儿童的心理发展是[ ]的
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【单选题】卫星通信是利用人造地球卫星作为中继站转发无线信-号，在两个或多个地球站之间进行的通信，其通信业务包括电报、电话、电视、数据传输及综合业务数字网等。 卫星最大的通信距离是( )km。
A.
40000
B.
20000
C.
18000
D.
12000
【单选题】以下关于铁路通信网的说法错误的是
A.
移动通信网提供无线语音、数据业务，如车地通信、手机通话、短信等
B.
基础承载网是为通信网运营提供支撑服务的网络，它包括同步网、信令网、网管及监控系统等
C.
支撑网是为通信网运营提供支撑服务的网络，它包括同步网、信令网、网管及监控系统等
D.
业务网是提供铁路通信业务网络的总称，包括铁路自动电话、调度通信、电视电话会议、视频监控、电报等系统
【单选题】Under rent control, tenants can expect
A.
lower rent and higher quality housing.
B.
lower rent and lower quality housing.
C.
higher rent and a shortage of rental housing.
D.
higher rent and a surplus of rental housing.
【单选题】Under rent control, landlords cease to be responsive to tenants' concerns about the quality of the housing because
A.
with rent control, the government guarantees landlords a minimum level of profit.
B.
they become resigned to the fact that many of their apartments are going to be vacant at any given time.
C.
with shortages and waiting lists, they have no incentive to maintain and improve their property.
D.
with rent control, it becomes the government's responsibility to maintain rental housing.
【单选题】According to the critics, rent control .
A.
will always benefit those who rent apartments
B.
is unnecessary
C.
will bring negative effects in the long run
D.
is necessary under all circumstances
【单选题】卫星通信是利用人造地球卫星作为中继站转发无线信-号，在两个或多个地球站之间进行的通信，其通信业务包括电报、电话、电视、数据传输及综合业务数字网等。 (1)卫星最大的通信距离是( )km。
A.
40000
B.
20000
C.
18000
D.
12000
【单选题】Under rent control, landlords cease to be responsive to tenants’ concerns about the quality of the housing because
A.
with shortages and waiting lists, they have no incentive to maintain and improve their property.
B.
they know they can never please their tenants.
C.
the law no longer requires them to maintain their buildings.
D.
it becomes the government’s responsibility.
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