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【单选题】
有些飞机的翼尖部位安装了翼稍小翼，它的功用是A.
A.减小摩擦阻力
B.
减小压差阻力
C.
C.减小诱导阻力
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】His parents thought he was working very hard in the room, _____in fact, he was chatting with his friends on the Internet.
A.
when
B.
where
C.
which
D.
while
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【简答题】什么条件下有源二端网络只存在诺顿等效电路,不存在戴维宁等效电路?
【简答题】With all his savings gone, he stared to look for a job.英译汉
【简答题】He__________ the envelope and recognized his father's handwriting. [ ] A. stared at B．glared at C. looked at D.glanced at