CPU与内存及I/O装置间传送数据的硬件线路通道称为 ______ 。
参考答案：总线
--- It’s difficult for the village children to cross the river for school.
--- I think a bridge _______ over the river.
A．should be built
B．is being built
C．has been built
D．was built
直流-感应电检查观察指标是什么?
