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Flying on a plane can cost a lot of money. Now is a good time to buy plane tickets ___41__ a low price. Many airlines are selling cheap tickets. A woman from a new station says ___42__ there are good prices now. But she also says that you must be___43___. You need to be sure that you really want these tickets before buying them. If changes need to be made ,it will cost a lot of money. You also need to use your tickets __44____ the middle of December. The airlines will not lose any money by selling these cheap tickets. They believe that many people will buy them. They will sell ___45__ tickets now because they cost less money. A. before B. more C. at D. careful E. that
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举一反三
【简答题】vt.丢弃;抛弃
【简答题】矩形系数 是用来说明小信号选频放大器( )好坏的性能指标,其值越接近于( ),放大器的选择性越好。单调谐放大器的 ≈( )。
【单选题】在测量三相功率的方法中，用两个功率表测量时，称作双功率表法，下列说法不对的有（）。
A.
三相功率等于两个表计读数之和
B.
在三相电路对称情况下，测量无功功率和有功功率都是准确的
C.
在三相电流不平衡情况下，测量有功功率是准确的
D.
在三相电流不平衡情况下，测量无功功率和有功功率都是不准确的
【简答题】vt.抛弃,丢弃,遗弃______