【简答题】The UN Security Council is made up of five permanent members and ______ non-permanent members.
【判断题】在实验室内使用气体钢瓶时,必须用铁链或钢瓶架等设施将钢瓶有效固定,以防止倾倒引发安全事故。
【单选题】某一个硅二极管当正向电压为0.7V时,测得它的正向电流为10mA,若正向电压增大到0.77V(即增加10%)时,正向电流约为( )。
【单选题】The Social Security Retirement Program is made up of two trust funds, ______ could go penniless by next year.
【单选题】Which of the following is NOT true of security attacks?
A.
Employees will keep up with security polices and awareness if they are highly-trained.
B.
The rate of security attacks appears faster than the growth of the Internet.
C.
One's computer system will never be fully secure.
D.
Vulnerabilities can go through phones, wireless devices, and network appliances.
【单选题】The suitcase of the woman speaker’s colleague was blown up by the security police probably because ______.
A.
it failed to pass the security check
B.
it was suspected of containing a bomb
C.
it contained dirty disease-carrying clothes
D.
it was suspected of containing smuggled goods
【单选题】The events of Sept. 11 have ratcheted up security at American airports to the highest level ever, according to a spokesman for Transportation Secretary Norman Mineta. But to say there is plenty of roo...
B.
helping others in smuggling
C.
being in the US illegally
D.
denying or not mentioning past crimes
【单选题】The suitcase of the female speaker's colleague was blown up by the security police probably because
A.
it failed to pass the security check.
B.
it was suspected of containing a bomb.
C.
it contained dirty disease-carrying clothes.
D.
it was suspected of containing smuggled goods.