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将凭证预先编号的目的是什么？

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肥皂的有效成分是脂肪酸钠盐，其含量的高低决定了肥皂的去污能力的大小。

A. 正确
B. 错误

You want to connect to your company network from your Windows 2000 Professional computer at home. You have an ISDN line that is used for internet connectivity. You create a VPN connection and are able to connect successfully to the company network. While connected to the company network, you are unable to access the Internet. What must you do so that you can access the Internet?（）

A. Configure the ISDN connection to use SLIP instead of PP
B. Select the Enable Internet Connection Sharing for this connection check box in the ISDN connection properties.
Clear the Use default gateway on remote network check box.
D. Install and configure the SAP Agent service.

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常用的直齿圆锥齿轮与正齿轮一样，都是依靠（）齿形的啮合来实现传动的。

A. 渐开线
B. 阿基米德螺旋线
C. 摆线
D. 圆弧

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室外空气状态变化时，一次回风空调系统中的分区调节，是以（）线分区的。

A. 等温
B. 等焙
C. 等露点
D. 等相对湿度

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