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【简答题】
对【图片】上非负、连续的函数f(x)，它的变上限积分【图片】在【图片】上有界是反常积分【图片】收敛的（）条件。（填写充分，必要，充分必要）
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举一反三
【单选题】Exhibit: Refer to the exhibit. The switch that generated this output has 24 ports. Why are some of the ports missing from VLAN1?
A.
The missing ports are in VLAN 86.
B.
The missing ports are administratively disabled.
C.
The missing ports are not participating in spanning tree.
D.
The missing ports are configured as trunk ports.
【单选题】Because some ports are becoming increasingly limited in their ability to handle ever-larger ships it is possible that ___.
A.
ship sizes will become smaller
B.
massive government programs will do what is necessary to upgrade the smaller ports
C.
large ships will go to “hub” ports where “feeder” ships will traverse to and from the smaller ports
D.
ocean shipping costs will rapidly decline
【单选题】压电传感器的等效电路()。
A.
可以等效为电压源，不可等效为电荷源
B.
不可等效为电压源，可以等效为电荷源
C.
既不可等效为电压源，也不可等效为电荷源
D.
既可等效为电压源，也可等效为电荷源
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