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问题 单项选择题

由硅酸盐水泥熟料、( )的石灰石或者是粒化高炉矿渣、适量石膏磨细制成的水硬性胶凝材料，称为硅酸盐水泥。

A．0%～5%

B．1%～3%

C．2%～6%

D．3%～5%

答案

参考答案：A

单项选择题

WAP uses (1) which includes the Handheld Device Markup Language (HDML) developed by Phone.com. WML can also trace its roots to eXtensible Markup Language (XML). A markup language is a way of adding information to your (2) that tells the device receiving the content what to do with it. The best known markup language is Hypertext Markup Language. (3) HTML, WML is considered a meta language. Basically, this means that in addition to providing predefined (4) , WML lets you design your own markup language (5) . WAP also allows the use of standard Internet protocols such as UDP, IP and XML.

5（）

A．consistents

B．points

C．components

D．parts
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选择题

如图所示，P是一个很大的金属板，水平放置，Q是一个带正电的点电荷，固定在板外．另一个可看作质点的带负电的小物体C，以一定的初速度从图中的a点沿金属板表面移动到b点，移动过程中C的带电量保持不变，它与金属板间的摩擦不能忽略．关于C的这段运动过程，下面的说法中正确的是[　　]

A．C对P板的压力先变小后变大

B．C的加速度先变小后变大

C．C的电势能先变小后变大

D．C的速度先变小后变大 
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