当控制器与OpenFlow交换机版本协商后,控制器向OpenFlow交换机发送()消息 A: Packet_out B: Packet_in C: Get Config Request D: Features Request

2.Image features are an important basis for image analysis and can be divided into two types: natural features and artificial features. Which of the followings are natural features( ) A: A. Temporal features B: B. Spectral features C: C. Edge features D: D. Geometric features

下列哪个消息用于控制器指导交换机的转发行为？ A: OFPT_PACKET_IN B: OFPT_PACKET_OUT C: OFPT_HELLO D: OFPT_FEATURES_REQUEST

We shall be glad to send you sample-cutting books and pamphlets of our new products______ . A: with request B: as request C: upon request D: at request

Match genre and features(副本) Match the main features to the proper genre.

In sand casting, the use of a Core in the Mold Cavity provides（ ） A: external features B: internal features C: internal external features D: none of the above

Differencebetween“ask”and“request”:“Ask”istheusualwordforspeakingorwritingtosomeoneinordertogetsomethingdone.“Request”ismoreformal.

中国大学MOOC: A deductive argument features certainty, and an inductive argument features probability.

7. _____, we are airmailing you our latest quotation sheet. A: As request B: At requested C: As your request D: At your request

request