有下列应用或实验现象：

①在玻璃生产车间里，利用有真空吸盘的吊车吊运平板玻璃

②用力拍衣服，衣服上的灰尘掉下来

③节日里放飞的氢气球，升到高空时会破裂

④在高山上需要使用高压锅才能将食物煮熟

以上四例中利用大气压工作的有_____________；能说明大气压随高度的升高而减小的有_________。

Asynchronous Transfer Mode (ATM) is a (16) that promises to change the fabric of local and wide area communications.
The key advantage of ATM is the capability to move voice, data, graphics and (17) at speeds of up to 2 gigabits per second.
An ATM switch allows you to create a (18) network that is completely independent from the (19) configuration of the network.
ATM uses a (20) called cell switching to convert data into fixed length cells of 53 bytes each, so they can be switched very quickly and efficiently.

A．technology

B．video images

C．logical

D．technique