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我国棉花管理有哪些重要政策法规？

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断路器操作失灵的处理原则是什么？

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采煤机滚筒升降动作缓慢的原因之一是：调高液压系统中安全阀损坏或调定值太低。

A. 正确
B. 错误

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You have configured accessibility options for Tom. Everything works fine. You want to configure that when Tom wants to use CTRL， ALT or Shift key simultaneously， he should has the option to press one key at a time？ What should you do to provide this feature to Tom？（）

A. Turn on FilterKeys, this will allow accessibility options to be turned on at will.
B. In accessibility options on the general tab, enable "turn off accessibility features after idle for xx minutes".
C. From the Keyboard tab of the accessibility option applet, check the StickyKeys checkbox, this will save all accessibility options when you exit the control panel applet.
D. In accessibility options on the general tab, disable "turn off accessibility features after idle for xx minutes".&e

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男性，50岁。右眼睑下垂，复视3个月。既往有蛛网膜下腔出血史。查体：神志清，右眼睑下垂，右眼球外斜，右侧瞳孔散大，对光反应和调节反应消失，双侧视神经乳头边缘清，色淡。CT扫描增强后发现鞍旁右侧有一小圆形高密度影，周围无明显水肿。为明确诊断，首选的检查是（）

A. 脑血管造影
B. 头颅MRI
C. 脑室造影
D. ECT
E. 头颅线平片

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