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问题 单项选择题

作用在刚架上的力如图示，力对固定端A点的力矩为（）。

A．Phcosa-Plsina

B．Plsin-Phcosa

C．Phsina-Plcosa

D．Plcosa-Phsina

答案

参考答案：A

解析：

力矩的计算方法

单项选择题

Application development increasingly means Windows development, and the popularity of visual development tools has (95) in tandem with Windows itself. These tools create beautiful windowing (96) , and their fast development cycles and easy learning curves make them a good (97) for many types of PC development projects. Today’s developers are leveraging these tools and the abundance of heap, powerful PCs to shift the balance of power to the desktop.

As the world moves inexorably toward Windows and other (98) user interfaces, developers can choose from an abundance of (99) oriented tools. Popular examples include Microsoft Corp.’s Visual Basic, Powersoft Corp.’s PowerBuilder, Gupta Technology Corp.’s SQL Windows, and so on.

97（）

A.choose 

B.selections 

C.choice 

D.select
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单项选择题

下列哪一项叙述足以表明动物细胞正在进行有丝分裂（）

A.核糖体活动加强

B.线粒体产生大量能量

C.高尔基体数目显著增加

D.中心体周围发射出星射线
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