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【单选题】
女性,26岁,因甲状腙癌行甲状腺全切除术,术后当晚出现呼吸困难,伤口肿胀有血液渗出。最佳急诊处理方法为A.
气管切开
B.
气管插管
C.
面罩吸氧
D.
静注地塞米松
E.
拆除缝线，敞开手术创腔
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举一反三
【简答题】已知 i ， j 分别是与x轴，y轴正方向相同的单位向量， OB 1 = ai - 6j （a∈R），对任意n， B n B n+1 = 6i +3? 2 n-1 j ． （1）若 OB 1 ⊥ B 2 B 3 ，求a的值； （2）求向量 OB n ．
【单选题】What did he do to make her happy.
A.
He studied much harder.
B.
He often took her for a tide.
C.
He alwaysendured her insults.
D.
He often bought her presents and meals.
【单选题】What did he do to make her happy? 查看材料
A.
He studied much harder.
B.
He often took her for a ride.
C.
He always endured her insults，
D.
He often bought her presents and meals.
【单选题】已知 i 、 j 分别是与x轴、y轴方向相同的单位向量，且 AC =-3 i +6 j ， BC =-6 i +4 j ， BD =- i -6 j ，则一定共线的三点是（ ）
A.
A，B，C
B.
A，B，D
C.
A，C，D
D.
B，C，D
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