The most frequent cause of major earthquakes is______.
A. faulting
B. folding
C. landslides
D. tidal waves
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dmz区域(非军事化区)的安全级别中等,因为需要对外开放某些特定的服务和应用,受一定的保护,是安全级别较低的区域。()
ieee最初制定的无线局域网标准是ieee802.1。()
The word "unwarranted"(line 3, para. 2)most probably means "______".
A. undeserved
B. unnecessary
C. extreme
D. unfair