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【简答题】
已知向量 a =（cosθ，sinθ）和 b=( 2 -sinθ，cosθ) ． （1）若 a ∥ b ，求角θ的集合； （2）若 θ∈( 5π 4 ， 13π 4 ) ，且| a - b |= 3 ，求 cos( θ 2 - π 8 ) 的值．
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A.
细菌毒力强
B.
感染细菌数量大
C.
细菌外毒素的作用
D.
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E.
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A.
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B.
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C.
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D.
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