直角程序的出航时间规定（）。A、1——2分钟 B、1——2.5分钟 C、1——3分钟

阅读下文，回答以下各题。
齐人未尝赂秦，终继五国迁灭，何哉与赢而不助五国也。五国既丧，齐亦不免矣。燕赵之君，始有远略，能守其土，义不赂秦。是故燕虽小国而后亡，斯用兵之效也。至丹以荆卿为计，始速祸焉。赵尝五战于秦，二败而三胜。后秦击赵者再，李牧连却之。洎牧以谗诛，邯郸为郡，惜其用武而不终也。且燕赵处秦革灭殆尽之际，可谓智力孤危，战败而亡，诚不得已。向使三国各爱其地，齐人勿附于秦，刺客不行，良将犹在，则胜负之数，存亡之理，当与秦相较，或未易量。

请你简要说明齐国和燕、赵两国灭亡的主要原因。

地脚螺栓的允许偏差不得超过螺栓长度的（）。

A、4/1000

B、5/1000

C、6/1000

D、7/1000

Most computer systems are (66) to two different groups of attacks: Insider attacks and outsider attacks. A system that is known to be (67) to an outsider attack by preventing (68) from outside can still be vulnerable to the insider attacks accomplished by abusive usage of (69) 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 (70) by tools referred to as Intrusion Detection Systems.

（70）处填（）。

A．searched

B．checked

C．tested

D．detected

对非国家投资项目而言，投资者在确定基准收益率时应以（）为基础。

A．资金限制和投资风险

B．资金成本和机会成本

C．目标利润和投资风险

D．资金成本和通货膨胀

消防联动控制装置的直流操作电压宜采用（）V。

A．50

B．48

C．36

D．24