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【多选题】
如图所示,一个半径和质量不计的定滑轮O固定在天花板上,物块 B 和 A 通过轻弹簧栓接在一起,竖直放置在水平地面上保持静止后,再用不可伸长的轻绳绕过滑轮连接物块 A 和 C ,物块 C 穿在竖直固定的细杆上, OA 竖直, OC 间距 l = 3m 且水平,此时 A 、 C 间轻绳刚好拉直而无作用力。已知物块 A 、 B 、 C 质量均为 2kg 。不计一切阻力和摩擦, g 取 10m/s 2 .现将物块C由静止释放,下滑 h = 4m 时物块 B 刚好被提起,下列说法正确的是( )
A.
．弹簧的劲度系数为 20N/m
B.
．此过程中绳子对物块 A 做的功为 60J
C.
．此时物块 A 速度的大小为 8 m/s
D.
．绳子对物块 C 做功的大小等于物块 A 动能的增加量
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参考答案：
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【简答题】向量的两要素 , 。
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【多选题】在对象上添加交互式效果后,( )删除交互式效果。
A.
可以
B.
不可以
C.
在属性栏中单击“清除”按钮
D.
执行“效果”菜单中的“清除”命令
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【单选题】In kindergarten, what did the author want to do when he grew up?
A.
work at a local grocery store
B.
dance
C.
leap on the moon
D.
be happy
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【单选题】What does the author want to tell us from the story?
A.
Dogs are a loyal and reliable animal.
B.
Dogs are man's best friends.
C.
Dogs also have rights to live a happy and humane life.
D.
Dogs will face their misfortune when they're getting old.
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【单选题】In line l0．when the author states that the owners“anxiously watch the sky”，there is the implication that the owners__________ ． 查看材料
A.
want their pigeons to win the race
B.
are sending radar signals to their pigeons
C.
do not know whether the race began on time
D.
do not trust the rules set down by the judges
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【多选题】交互式阴影工具可以对下列哪些对象创建阴影效果（）。
A.
位图图象
B.
添加了交互式立体效果的图形
C.
美术文本
D.
添加了交互式封套效果的图形
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【判断题】Hemingway's "The Old Man and the Sea" tells the story of the Greek hero's ten-year sea adventure.
A.
正确
B.
错误
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【判断题】企业应该强制培养员工的组织公民行为,以发挥其积极作用。
A.
正确
B.
错误
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【判断题】企业应该强制培养员工的组织公民行为,以发挥其积极作用。
A.
正确
B.
错误
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【单选题】Why did the author want to work at the Market Basket when he was young?
A.
Because he thought it would be fun to swipe orange juice across the scanner at the checkout counter.
B.
Because it was the typical dream of a five-year-old.
C.
Because he wanted his parents to see at Back to School Night.
D.
Not mentioned.
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相关题目：
【简答题】向量的两要素 , 。
查看完整题目与答案
【多选题】在对象上添加交互式效果后,( )删除交互式效果。
A.
可以
B.
不可以
C.
在属性栏中单击“清除”按钮
D.
执行“效果”菜单中的“清除”命令
查看完整题目与答案
【单选题】In kindergarten, what did the author want to do when he grew up?
A.
work at a local grocery store
B.
dance
C.
leap on the moon
D.
be happy
查看完整题目与答案
【单选题】What does the author want to tell us from the story?
A.
Dogs are a loyal and reliable animal.
B.
Dogs are man's best friends.
C.
Dogs also have rights to live a happy and humane life.
D.
Dogs will face their misfortune when they're getting old.
查看完整题目与答案
【单选题】In line l0．when the author states that the owners“anxiously watch the sky”，there is the implication that the owners__________ ． 查看材料
A.
want their pigeons to win the race
B.
are sending radar signals to their pigeons
C.
do not know whether the race began on time
D.
do not trust the rules set down by the judges
查看完整题目与答案
【多选题】交互式阴影工具可以对下列哪些对象创建阴影效果（）。
A.
位图图象
B.
添加了交互式立体效果的图形
C.
美术文本
D.
添加了交互式封套效果的图形
查看完整题目与答案
【判断题】Hemingway's "The Old Man and the Sea" tells the story of the Greek hero's ten-year sea adventure.
A.
正确
B.
错误
查看完整题目与答案
【判断题】企业应该强制培养员工的组织公民行为,以发挥其积极作用。
A.
正确
B.
错误
查看完整题目与答案
【判断题】企业应该强制培养员工的组织公民行为,以发挥其积极作用。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Why did the author want to work at the Market Basket when he was young?
A.
Because he thought it would be fun to swipe orange juice across the scanner at the checkout counter.
B.
Because it was the typical dream of a five-year-old.
C.
Because he wanted his parents to see at Back to School Night.
D.
Not mentioned.
查看完整题目与答案
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