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【判断题】
井下供电系统中应做到的“三无”是无鸡爪子、无羊尾巴、无老鼠洞。
A.
正确
B.
错误
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举报参考答案：
举一反三
【单选题】SS9型电力机车，列车供电柜网压同步信号来自( ) 。
A.
互感器
B.
860V交流侧的同步变压器
C.
微机柜输出
D.
主变压器a2，x2(a4-x4) 绕组上的同步变压器
【单选题】The Fisherman and the bearOne fine day, an old man was fishing and caught nothing. Finally, he gave up and walked back along the shore to his shack（窝棚）. When he got close to the front door, he saw it ...
A.
It held the paw out over the water.
B.
The bear jumped and ran out of the door.
C.
He walked to the door quietly and looked inside.
D.
The bear was gone and had left six large fish for him.
E.
The bear often came to the old man's shack to get honey.
F.
Every time a fish jumped after his paw the bear hit it ashore.
【单选题】The Fisherman and the bearOne fine day, an old man was fishing and caught nothing. Finally, he gave up and walked back along the shore to his shack（窝棚）. When he got close to the front door, he saw it ...
A.
It held the paw out over the water.
B.
The bear jumped and ran out of the door.
C.
He walked to the door quietly and looked inside.
D.
The bear was gone and had left six large fish for him.
E.
The bear often came to the old man's shack to get honey.
F.
Every time a fish jumped after his paw the bear hit it ashore.
相关题目：
【单选题】SS9型电力机车，列车供电柜网压同步信号来自( ) 。
A.
互感器
B.
860V交流侧的同步变压器
C.
微机柜输出
D.
主变压器a2，x2(a4-x4) 绕组上的同步变压器
【单选题】The Fisherman and the bearOne fine day, an old man was fishing and caught nothing. Finally, he gave up and walked back along the shore to his shack（窝棚）. When he got close to the front door, he saw it ...
A.
It held the paw out over the water.
B.
The bear jumped and ran out of the door.
C.
He walked to the door quietly and looked inside.
D.
The bear was gone and had left six large fish for him.
E.
The bear often came to the old man's shack to get honey.
F.
Every time a fish jumped after his paw the bear hit it ashore.
【单选题】The Fisherman and the bearOne fine day, an old man was fishing and caught nothing. Finally, he gave up and walked back along the shore to his shack（窝棚）. When he got close to the front door, he saw it ...
A.
It held the paw out over the water.
B.
The bear jumped and ran out of the door.
C.
He walked to the door quietly and looked inside.
D.
The bear was gone and had left six large fish for him.
E.
The bear often came to the old man's shack to get honey.
F.
Every time a fish jumped after his paw the bear hit it ashore.
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