作业按其堪次分类，可以分为（）。A．单位作业 B．批次作业 C．支持作业 D．整体作

穿过股管下口的结构是（）

A.股神经

B.股静脉

C.股动脉

D.大隐静脉

E.精索

Which of the following statements is NOT implied in the passage

A．Teachers are sociable.

B．Teachers are role models.

C．Teachers are paid agents of socialization.

D．Teachers are knowledgeable and skillful.

根据《国务院关于预防煤矿生产安全事故的特别规定》，煤矿实行整体承包生产经营后，为重新取得（），从事生产的，应当立即停止作业，排除隐患。

A.安全生产许可证

B.煤炭生产许可证

C.矿长安全资格证

D.采矿许可证

MIDI enables people to use (11) computers and electronic musical instruments. There are actually three components to MIDI, the communications" (12) .", the Hardware Interface and a distribution (13) called "Standard MIDI Files". In the context of the WWW, the most interesting component is the (14) Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol (15) are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.

（15）是（）

A.messages

B.packets

C.frame

D.information