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【判断题】
手电钻在使用前应检查电线是否完好，当电线表皮有裂纹时禁止使用。A.
正确
B.
错误
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
【简答题】对于一般照明而言,日常最需要的就是白色的光源。产生白光主要有两种方法 : 一种是 。另一种方法就是将 。
【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】He__________ the envelope and recognized his father's handwriting. [ ] A. stared at B．glared at C. looked at D.glanced at
【简答题】什么条件下有源二端网络只存在戴维宁等效电路,不存在诺顿等效电路?
【单选题】What does James like about his job as a nanny?
A.
He has received encouragement from his friends.
B.
He can easily do better than women nannies.
C.
He has more freedom to plan his own work.
D.
He is allowed to try out unusual methods.
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