工件材料愈硬，刀具前角愈小，切削厚度（）时，易产生蹦碎切削.

咳嗽上气

MIDI enables people to use （66） computers and electronic musical instruments. There are actually three components to MIDI, the communications " （67） ", the Hardware interface and a distribution （68） called "Standard MIDI Files". In the context of the WWW,the most interesting component is the （69） Format. In principle, MIDI files contain sequences of MIDI Protocol messages. However, when MIDI Protocol （70） 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.

A．personal

B．electronic

C．multimedia

D．network

BIOS最重要的组成部分是______。

A) 主板ROM BIOS
B) 适配卡BIOS(如显卡)
C) 扩充卡BIOS
D) 从磁盘上装入(驱动程序)

患者男性，11岁，因“骑自行车自山坡上小路冲下山坡，被横在路上的晾衣绳勒伤颈部，出现咽喉痛、声嘶、吞咽困难，颈部皮肤肿胀，进行性呼吸困难”来诊。

最有可能的诊断是（）

A.颈椎脱位

B.急性喉炎

C.气胸

D.闭合性喉外伤

E.食管断裂

有一职工受工伤，工厂打算帮其申请工伤认定，具体应该怎么操作？有时间限制吗？我们厂在上海。