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【简答题】
在较短时间内引起触电者心室颤动而危及生命的最小电流,称为(),一般通电1s以上,()的电流就足以致命。
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【简答题】I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store. 　 小I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store. ____ 小题1:____...
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【单选题】如图所示，用甲、乙两个滑轮组来提相同重物G，甲图中两个动滑轮共重5N，乙图中一个动滑轮重3N，不计摩擦和绳重，则两个滑轮组的机械效率（　　）
A.
甲比乙大
B.
甲比乙小
C.
一样大
D.
以上三种情况都可能
查看完整题目与答案
【简答题】That day I was later for school, so Mom offered me a 36 . I sat beside her in our car, daydreaming about my 37 . I’d be graduating from high school in a few months. I’d leave high school behind and do...
查看完整题目与答案
【判断题】图中接触面不计摩擦,物体AD在四处受接触面约束反力作用。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】I was ten when I first sat with my grandmother behind the cashier（收银台）in her general store. 71 I quickly learned the importance of treating customers politely and saying “thnak you.” At first I was pa...
A.
Later I received 50 cents an hour.
B.
Before long, she let me sir there by myself.
C.
I ended my selling a record amount of cosmetics.
D.
Today I still carry that lesson with me: I listen to customers.
E.
My grandma’s trust taught me how to handle responsibility.
F.
Soon I found myself looking more beautiful than ever before. G. Watching my money grow was more rewarding than anything I could have bought. __________
查看完整题目与答案
【判断题】三相异步电动机在制动状态下运行时,转差率 s>1 。
A.
正确
B.
错误
查看完整题目与答案
【单选题】She sat at her desk,   with her eyes ________ on the book,   ________ in its plot. [     ]
A.
fixing;  absorbing
B.
fixed;  absorbed
C.
fixed;  absorbing
D.
fixing;  absorbed
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【单选题】When I came in，I saw her ________ in the sofa ________ in thought．
A.
sat；deep
B.
sitting；deeply
C.
seated；deep
D.
seating；deeply
查看完整题目与答案
【多选题】关于单向板分布筋描述正确的是 ( ) 。
A.
绑扎固定受力筋位置
B.
承受板中的温度应力和混凝土收缩应力
C.
将作用于板上的集中或局部荷载分散给更大范围的受力筋承受
D.
布置在受力钢筋之下
E.
对四边支承板，可承受在计算中未计及但实 际存在的长跨方向的弯矩
查看完整题目与答案
【单选题】如图所示的装置中，不计滑轮摩擦，当水平向右拉力F=5N时，物体m恰能匀速运动，那么物体受地面的摩擦力的大小为( )。
A.
5N
B.
2.5N
C.
10N
D.
7.5N
查看完整题目与答案
相关题目：
【简答题】I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store. 　 小I was ten when I first sat with my grandmother behind the cashier(收银台)in her general store. ____ 小题1:____...
查看完整题目与答案
【单选题】如图所示，用甲、乙两个滑轮组来提相同重物G，甲图中两个动滑轮共重5N，乙图中一个动滑轮重3N，不计摩擦和绳重，则两个滑轮组的机械效率（　　）
A.
甲比乙大
B.
甲比乙小
C.
一样大
D.
以上三种情况都可能
查看完整题目与答案
【简答题】That day I was later for school, so Mom offered me a 36 . I sat beside her in our car, daydreaming about my 37 . I’d be graduating from high school in a few months. I’d leave high school behind and do...
查看完整题目与答案
【判断题】图中接触面不计摩擦,物体AD在四处受接触面约束反力作用。( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】I was ten when I first sat with my grandmother behind the cashier（收银台）in her general store. 71 I quickly learned the importance of treating customers politely and saying “thnak you.” At first I was pa...
A.
Later I received 50 cents an hour.
B.
Before long, she let me sir there by myself.
C.
I ended my selling a record amount of cosmetics.
D.
Today I still carry that lesson with me: I listen to customers.
E.
My grandma’s trust taught me how to handle responsibility.
F.
Soon I found myself looking more beautiful than ever before. G. Watching my money grow was more rewarding than anything I could have bought. __________
查看完整题目与答案
【判断题】三相异步电动机在制动状态下运行时,转差率 s>1 。
A.
正确
B.
错误
查看完整题目与答案
【单选题】She sat at her desk,   with her eyes ________ on the book,   ________ in its plot. [     ]
A.
fixing;  absorbing
B.
fixed;  absorbed
C.
fixed;  absorbing
D.
fixing;  absorbed
查看完整题目与答案
【单选题】When I came in，I saw her ________ in the sofa ________ in thought．
A.
sat；deep
B.
sitting；deeply
C.
seated；deep
D.
seating；deeply
查看完整题目与答案
【多选题】关于单向板分布筋描述正确的是 ( ) 。
A.
绑扎固定受力筋位置
B.
承受板中的温度应力和混凝土收缩应力
C.
将作用于板上的集中或局部荷载分散给更大范围的受力筋承受
D.
布置在受力钢筋之下
E.
对四边支承板，可承受在计算中未计及但实 际存在的长跨方向的弯矩
查看完整题目与答案
【单选题】如图所示的装置中，不计滑轮摩擦，当水平向右拉力F=5N时，物体m恰能匀速运动，那么物体受地面的摩擦力的大小为( )。
A.
5N
B.
2.5N
C.
10N
D.
7.5N
查看完整题目与答案
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