物业管理绩效评价是以（）作为具体评价对象

A、物业管理企业的盈利能力

B、资产运营水平

C、偿债能力

D、物业管理企业

Microwave communication uses high-frequency (71) waves that travel in straightlines throughthe air. Because the waves cannot (72) with the curvature of the earth, they can be (73) only over short distance. Thus, microwave is a good (74) for sendingdata between buildings ina city or on a large college campus. For longer distances, the wavesmust be relayed by means of"dishes" or (75) . These can be installed on towers, highbuildings, and mountain tops.

A．transmitted

B．transformed

C．converted

D．delivered