燃气管道穿越电车轨道和城镇主要干道时宜敷设在套管或地沟内；穿越高速公路的燃气管道的套

如果患者咀嚼时，下颌长期处于侧方运动幅度较大时，则患者牙列的磨耗状态是（）。

A.上颌颊尖和下颌舌尖磨损过多

B.上颌舌尖和下颌颊尖磨损过多

C.下前牙切缘较后牙牙尖磨损过多

D.双侧后牙颊舌尖及尖牙牙尖磨耗较重

E.横曲线的曲度加大

Most computer systems are (71) to two different groups of attacks：insider attacks and outsider attacks．A system that is known to be (72) to an outsider attack by preventing (73) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (74) users．Detecting such abusive usage as well as attacks by outsides not only provides information on damage assessment,but also helps to prevent future attacks．These attacks are usually (75) by tools referred to as Intrusion Detection Systems．

（73）处填（）。

A．visit

B．access

C．I/O

D．read/write

如果立法会以大多数票数三读通过了法律草案，法律草案便会呈交行政长官，行政长官签署后，这条例便会在下一期的《香港宪报》的（）公布.

A、《法律副刊第一号》

B、《法律副刊第二号》

C、《法律副刊第三号》

D、《法律副刊第五号》

阐述信息梯度转移规律。

原始社会早期的石制工具包含艺术活动的因素，这说明工艺美术的物起源于（）。

A.生产

B.劳动

C.绘画

D.文化