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问题 选择题

下列变化不属于化学变化的是（　　）

A．

B．

C．

D．

答案

A、只是洗涤剂的乳化功能，并没有其他物质生成，因而不属于化学变化．B、是浓硫酸的脱水性，生成黑色的炭．C、涉及碳酸钙与二氧化碳和水的反应，以及碳酸氢钙的分解，D、涉及酸碱中和反应，因而B、C、D都有新物质生成，是化学变化．故选A．

单项选择题

关闭与用火设备（管线）相连的阀门，并加好（）。

A、盖板

B、标示

C、盲板

D、石棉布
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单项选择题

WAP uses (71) , 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 (72) that tells the device receiving the content what to do with it. The best known markup language is Hypertext Markup Language. (73) HTML, WML is considered a meta language. Basically, this means that in addition to providing predefined (74) , WML lets you design your own markup language (75) . WAP also allows the use of standard Internet protocols such as UDP, IP and XML.

（71）处填（）。

A．HTML

B．XML

C．DML

D．WML
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