【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.
【判断题】Apareció en el balcón de su casa un señor en negro
【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
【判断题】Apareció en el balcón de su casa un señor en negro.
【简答题】已知 , ,若 ,则 ________;
【判断题】低渗性脱水主要特征是 失钠<失水。< /div>