
【名词&注释】
超短波通信(ultra-short wave communication)、外界压力(external pressure)、阀控密封式铅酸蓄电池
[判断题]ISDN 中的 D 信道用于传送电路交换的信令信息和分组数据信息。( )
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举一反三:
[多选题]A sensor network is ( ) of a large number of sensor nodes that are densely deployed ( ) inside the phenomenon or very close to it.
A. part
B. consist
C. consisted
D. composed A.either
E. from
F. at
G. of
[单选题]超短波通信只能靠直线方式传输,传输距离约( )km。
A. 50
B. 100
C. 150
D. 200
[单选题]阀控密封式铅酸蓄电池在充电状状下壳内压力与外界压力相比要().
A. 一致
B. 高
C. 低
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