沉积岩可分为碎屑岩,粘土岩,化学和生物化学岩三大类.
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（EMB145）哪个舵面没有使用到液压系统作为动力？（）
A. 升降舵
B. 方向舵
C. 副翼
对于钢结构的一级焊缝，可以采用的无损检测方法有（）。
A. 超声波探伤
B. 射线探伤
C. 磁粉探伤
D. 渗透探伤
Which three statements about end-to-end delay are true？ （）
A. End-to-end delay is the sum of propagation delays， processing delays， serialization delays， and queuing delays.
B. Coast-to-coast end-to-end delay over an optical link is about 20 ms.
C. Processing delay depends on various factors， which include CPU speed， CPU utilization， IP switching mode， and router architecture.
D. Propagation and serialization delays are related to the media.
E. Propagation delay is the time it takes to transmit a packet and is measured in bits-per-second （bps）.
F. Serialization delay is the time it takes for a router to take the packet from an input interface and put it into the output queue of the output interface.
墙体的保温分为外保温和内保温，外保温的保温性能远高于内保温。
A. 正确
B. 错误
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