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【单选题】
（4）按下按钮电动机起动运转，松开按钮电动机仍然运转，只有按下停止按钮，电动机才停止的控制称为（ ）控制。A．正反转 B．制动 C．自锁 D．点动A.
正反转
B.
制动
C.
自锁
D.
点动
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举一反三
【单选题】Section B Passage One 26.
A.
She was the first female Doctor of Medicine .
B.
She was the best nineteenth - century physician .
C.
She studied at many famous medical schools .
D.
She practiced medicine in Asia and Africa .
【单选题】section B 26.
A.
They want children to keep them company.
B.
They want to enrich their life experience.
C.
They need looking after in their old age.
D.
They care a lot about children.
【简答题】reading comprehension Section A 26.
【多选题】在RSTP协议中定义了与STP中不同的端口角色,其中不能处于转发状态的端口角色是:(多选)
A.
Root port
B.
Designated Port
C.
BACKUP PORT
D.
ALTEMATE PORT
【简答题】reading comprehension Section A 26.
【简答题】Section A Now the test will begin. 1. A) a conference. B) He’ll have a conference next Friday. C) He’s waiting for the man in his office. D) He won’t be available until next Friday.
【多选题】在 RSTP协议中定义了与STP中不同的端口角色,其中不能处于转发状态的端口角色的是:(多选)
A.
Root Port
B.
Designated Port
C.
Backup Port
D.
Alternate Port
【简答题】Section A 26.
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