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【多选题】
Based on the show spanning-tree vlan 200 output shown in the exhibit， which two statements about the STP process for VLAN 200 are true？ （）A.
BPDUs will be sent out every two seconds.
B.
The time spent in the listening state will be 30 seconds.
C.
The time spent in the learning state will be 15 seconds.
D.
The maximum length of time that the BPDU information will be saved is 30 seconds.
E.
This switch is the root bridge for VLAN 200.
F.
BPDUs will be sent out every 10 seconds.
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举一反三
【单选题】Exams, grades and marks should be abolished because children's progress should be estimated only by ______.
A.
educated persons
B.
the children themselves
C.
teachers
D.
parents
【单选题】In Arkwright's view, what property should a spinning machine have?
A.
It should not require a skilled operator to run it.
B.
It should be powered by electricity.
C.
It should be able to produce 128 threads at one time.
D.
It should be operated by hand.
【单选题】Exams, grades, and marks should be abolished because children's progress should only be assessed by ______.
A.
educated persons
B.
the children themselves
C.
teachers
D.
parents
【单选题】It' s strange that you ______ like that at the meeting.
A.
should speak
B.
spoke
C.
should have spoken
D.
speak
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