引起瓦斯爆炸的火源主要有明火、电火花、电器失爆、电弧或炽热金属表面的部件、放炮火焰、自然发火以及摩擦火花。
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溶血性贫血下列何项是正确的()
A. 红细胞破坏过多
B. 红细胞寿命期缩短
C. 骨髓造血代偿机能大于正常6-8倍
D. 以上都对
A company implements video conferencing over IP on their Ethernet LAN. The users notice that the network slows down, and the video either stutters or fails completely. What is the most likely reason for this?()
A. minimum cell rate (MCR)
B. quality of service (QoS)
C. modulation
D. packet switching exchange (PSE)
E. reliable transport protocol (RTP)
Where is the rsh log located?()
A. /var/spool
B. /var/perf
C. /var
D. /var/adm
利润表的格式主要有多步式和单步式两种,我国采用多步式。
A. 正确
B. 错误