These machines have raised______ many times.A、proficiencyB、frequencyC、efficien

游客2025-04-03 37

问题 These machines have raised______ many times.

选项 A、proficiency
B、frequency
C、efficiency
D、effect

答案 C

解析 efficiency n.效率；功效(如：to increase efficiency．She admired his efficiency．)。proficiency n.熟练，精通。frequency n.次数，频繁；频率，出现率。effect n.结果；效果，作用，影响。

转载请注明原文地址:http://tihaiku.com/zcyy/4025098.html

相关试题推荐

随机试题

最新回复(0)

Computerprogrammersoftenremarkthatcomputingmachines,withaperfectla