温风干燥时要以大风量循环,以保证各点温度缓慢上升。
A. 正确
B. 错误
结构片式消声器由消声片组成,主要用于进、排风土建风道内。
A. 正确
B. 错误
Which two statements are true about the application of QoS in a converged network?()
A. end-to-end network delay times that exceed 50 ms for real-time traffic are considered unacceptable
B. end-to-end network delay times that exceed 250 ms for real-time traffic are considered unacceptable
C. end-to-end network delay is not a factor as long as the delay is consistent
D. some packet loss can be corrected by codec algorithms
E. RSVP handles voice packet retransmission
F. fragmentation is a result of packet lo
联合国不能有效地制止1999年的北约轰炸南联盟和2003年的美伊战争,其主要原因在于()
A. 联合国在维护世界和平方面起不到应有的作用
B. 美国和北约完全操纵了联合国
C. 联合国的成员国之间矛盾重重
D. 某些大国推行强权政治,无视国际公约