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【单选题】
表示锥面的方程为:A.
B.
C.
D.
以上都不是
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【简答题】( ) protocols, such as passwords, PINs, and fingerprint scanners, are the first line of defense against data thieves and snoopers.
【单选题】Article V of the North Atlantic Treaty calls for NATO members to come to the defense of a fellow member under attack. It was invoked for the first time when __________.
A.
the Soviet Union and East Germany constructed the Berlin Wall
B.
Ethiopia attacked Somalia
C.
Serbs attacked Bosnia in 1994
D.
the United States came under terrorist attack in 2001
【简答题】美国心理学家詹姆斯提出了需要层次理论。（ ）
【简答题】美国心理学家詹姆斯提出了需要层次理论。（ ）
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