Which of the following is NOT an element of high-speed rail? A: Speeds up to 199 km/h. B: The need for a wider curve radius. C: Tracks made with continuous welded rails. D: The use of dedicated lines or upgraded existing lines.

which address signals are used to generate the chip select signal of the memory chip for the one-to-one mapping of the memory chip to the logical storage space of the computer system? A: some of the high-order address signals of the address bus B: the lower-order address signals of the address bus C: all remaining high-order address signals of the address bus D: One of the remaining high-order address signals of the address bus

The 89C51 extension parallel three bus refers to the address bus, the data bus and

The less expensive option of constructing special tracks for high-speed train is utilizing __________ . A: dedicated lines B: existing lines C: specail lines D: continuous welded rails

on a map, there are horizontal lines and ____ lines. A: vertical <br/>B,<br/>straight <br/>parallel<br/>Double