The underground connection system is _______ two levels.

The underground connection system is ___ two levels.A. made inB. made up ofC. ma

[单选题] The connection between two networks to form. an internet is handled by a machine known as a （71） .（71）A．bridgeB．clientC．routerD．switch

[单选题]The connection between two networks to form. an internet is handled by a machine known as a ______．A．bridgeB．clientC．routerD．switch

[单选题]The connection between two networks from an intemet is handled by a machine known as a（）A . bridgeB . serverC . routerD . switch

[单选题]The two goals of an operation system are( )and efficiency．A．convenienceB．quickC．optimizeD．standardize

[单选题]The connection between two networks to form an intemet is handled by amaclu

[单选题]The two goals of an operation system are（71）and efficiency.（71）A．convenienceB．quickC．optimizeD．standardize

In addition to a two-party system, there are still several minor parties, such a

[名词解释] 地道 underground path

[单选题]The problem of underground water is more serious because（ ）[A] the underground water trickles away all the year round[B] the underground water is hidden deep beneath the Earth[C] the change of it must be controlled by the NASA's satellites[D] the dr