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原核（拟核、类核）

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胃的蠕动错误的是（）

A. 运动部位在胃尾区（胃体下2/3和胃窦）
B. 开始部位在胃的中部
C. 节律性蠕动
D. 能使食物充分混合
E. 推动无方向性

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靠空穴导电的半导体叫空穴半导体，简称（）型半导体。

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半导体有三个主要特性：（）特性；（）特性；（）特性。

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Your mobile device runs the latest version of the Microsoft Windows Mobile operating system. Your mobile device supports the use of Bluetooth and Infrared （IR） for data synchronization. You need to configure data synchronization on your computer to only use Bluetooth. Which three actions should you perform？（）

A. Clear the Allow USB connections check box.
B. Select the Allow USB connections check box.
C. Select the Bluetooth option from the drop down list.
D. Clear the Allow connections to one of the following check box.
E. Select the Allow connections to one of the following check box.
F. Install the latest version of Microsoft ActiveSync on the computer and perform an initial sync.

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