以下为GPIO端口配置寄存器的描述，在GPIO控制LED电路设计时，要使最大输出速度为2MHz，应该设置MODE[1:0]值为（ ）8a324f8eb252533cfa0544b0df33a210.jpg5ff693b9c72fd930994a4af1b072934a.jpg

如果GPIO端口接机械式按键且外部已上拉至高电平或低电平，那么应选择配置模式（）。 A: GPIO_Mode_AIN模拟输入 B: GPIO_Mode_IN_FLOATING浮空输入 C: GPIO_Mode_IPD下拉输入 D: GPIO_Mode_IPU上拉输入

The following features that do not belong to floating elements are( ) A: Floating elements<br/>will be automatically set to block elements for display B: A floating<br/>element is in the same position in the vertical direction as when it<br/>is not defined as floating C: The floating<br/>element is horizontal, and it will be as close as possible to the<br/>edge of its parent element D: Block elements do<br/>not drill under floating elements and are not covered by floating<br/>elements.

The Three-Tier model of the database system is（）. A: Up mode, mode, Down mode B: Front mode, mode, Rear mode C: External mode, mode, internal mode D: Large mode, Medium mode, Small mode

The following statement about floating is wrong (). A: The floating of<br/>elements is horizontal, which means that elements can only move left<br/>and right, but not up and down. B: Floating it is<br/>very useful in web page layout. C: Elements before<br/>floating elements will also be affected. D: The element after<br/>the floating element will surround it

subtractive color mode refers to A: CMYK mode B: RGB mode C: HSB mode D: LAB mode

Additive color mode refers to A: RGB mode B: HSB mode C: CMYK mode D: LAB mode

What is the most common mode for a firewall？（） A:  routed mode B:  context mode C:  bridged mode D:  transparent mode E:  full security mode

P mode display A: Program exposure mode B: Aperture priority mode C: Shutter priority mode D: Manual mode

GPRS/EDGE网络有3种运作模式：MODEⅠ、MODEⅡ和MODEⅢ。以下说法正确的是（） A: MODEⅠ可以选择是否配置MPDCH，MODEⅡ不能配置MPDCH，MODEⅢ一定要配置MPDCH； B: MODEⅠ必须配置MPDCH；MODEⅡ可以选择是否配置MPDCH，MODEⅢ不能配置MPDCH； C: MODEⅠ不能配置MPDCH；MODEⅡ必须配置MPDCH；MODEⅢ可以选择是否配置MPDCH； D: 无论何种MODE，均可以不配置FPDCH；