皮皮学，免费搜题
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【单选题】
按下列哪组快捷键可以显示或隐藏标尺栏A.
ctrl+t
B.
ctrl+r
C.
ctrl+g
D.
ctrl+c
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
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皮皮学刷刷变学霸
举一反三
【简答题】已知向量 ，若 ，则 ______；若 则 ______。
【简答题】You should select your main points carefully, ______, and arrange them strategically.
【单选题】The Gulf of Guinea is strategically important to the United States because ______.
A.
roughly 15% of oil production of West Africa is supplied to the United States
B.
West African reserves are forecast to reach the Persian Gulf size
C.
its oil can help lessen U.S. dependence on Middle Eastern oil
D.
its waters border Cameroon, Congo, Gabon, Equatorial Guinea and Nigeria
【简答题】已知 , ，若 ，则 ________；
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