如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地

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问题:

如图所示,AB是一质量为m的均匀细直杆,A端靠在光滑的竖直墙壁上,B端置于水平地面上,杆身与竖直方向夹角为θ,杆与地面的摩擦系数为μ,保持平衡,则此时杆与地面的摩擦力为(  )

A.mgtgθ

B.mgsinθ

C.μmg

D.μmg

考点:摩擦力的大小摩擦力的种类杠杆的平衡条件
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累计工作满20年以上的职工,请病假累计()以上的,该职工不再享受当年年休假。

A.1个月

B.2个月

C.3个月

D.4个月

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简述国防建设成就

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德国古典文学指的是哪一个时期的文学?代表性的作家是谁?有何特点?

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With the sudden onset of severe psychotic symptoms, the individual is said to be experiencing acute schizophrenia (精神分裂症). "Psychotic" means out of touch with reality, or unable to separate real from unreal experiences. Some people have only one such psychotic episode. Others have many episodes during a lifetime but lead relatively normal lives during interim periods. The individual with chronic (continuous or recurring) schizophrenia often does not fully recover normal functioning and typically requires long-term treatment, generally including medication, to control the symptoms. These symptoms may include hallucinations (幻觉), incoherence, delusions, lack of judgment, deterioration of the abilities to reason and feel emotion, and a lack of interaction between the patient and his environment. The hallucinations may be a visual, auditory, or tactile. Some chronic schizophrenic patients may never he able to function without assistance of one sort or another.

According to this passage, thinking that one can fly might be an example of ______.

A. medicine overdose
B. being out of touch with reality
C. recovering normal functioning
D. symptom control

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北京奥运会组委会是承办第()届奥林匹克运动会和第()届残疾人奥林匹克运动会的组织机构。

A.28;11

B.29;12

C.29;13

D.29;14

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