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单选题
The guard, fencing or shielding for moving parts or machinery can be removed for repair only when the machinery it belongs to（）
A
stays at rest
B
is working stably
C
is worn out
D
is in good operation
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stays at restB
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单选题When performing a backup， which of the following media types would have no moving parts？（）A
TapeB
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BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network. B
BPDU guard can guarantee proper selection of the root bridge.C
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BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port.E
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