双机吊装时，为了确保吊装时安全可靠，各起重机分配的载荷不宜超过其安全起重量的（）。
A、50%
B、60
C、75%
D、80%
参考答案：D
--Why were you not at the concert last night?
--I _______a close game between Seattle and Miami.
A. watched B. had watched
C. have been watching D was watching
CAS延迟时间是指内存（）地址脉冲的反应时间，是在一定频率下衡量不同规范内存的重要标志之一。
A、纵向
B、横向
C、反向
D、正向
