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【单选题】
若对称矩阵 满足 ,则矩阵 是( )。A.
负定矩阵
B.
半正定矩阵
C.
正定矩阵
D.
不确定
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举一反三
【单选题】— How long has he been in the army?— Oh, he joined the army as far______as .
A.
ago
B.
away
C.
from
D.
back
【简答题】长沙菊花石主要产于什么地方？
【单选题】He served in the army in whenhe was in
A.
． 1940’s ； his twenties
B.
． the 1940s ； thetwenties
C.
． 1940s’ ； histwenties
D.
． the 1940’s ； his twenties
【简答题】大放脚有()和()两种
【简答题】the robot army__________
【单选题】---Does your brother serve in the army? ---No, not now. But he ________ in the army for 8 years.
A.
would serve
B.
was serving
C.
had served
D.
served
参考解析：
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