皮皮学，免费搜题
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【单选题】
已知向量 a =（2，1）， a ? b =10，| a + b |= 5 2 ，则| b |=（ ）A.
5
B.
10
C.
5
D.
25
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参考解析：
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皮皮学刷刷变学霸
举一反三
【单选题】The missing boys were last seen () near the river.
A.
to play
B.
play
C.
to be playing
D.
playing
【简答题】常用局麻药按其化学结构可分为_、_
【单选题】患儿小恒,一岁半,有肋骨串珠,肋隔沟,手镯及脚镯征,下肢为O型腿,长骨X线片干端呈毛刷状及杯口状改变,该患儿最可能诊断是( )
A.
软骨营养不良
B.
佝偻病初期
C.
佝偻病激期
D.
佝偻病恢复期
E.
佝偻病后遗症期
【单选题】What was the writers dream while working at a golf course?
A.
Making a lot of money by playing golf.
B.
Becoming a successful golfer.
C.
Running a golf course near his house.
D.
Both A & B
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