問題詳情

第 31 至 35 題為題組Since the early 1990s, the lithium-ion battery has been the most suitable battery for portableelectronic equipment. Today, they’re commonly used for cellphones, computers, tablets, digitalcameras, and other devices.Lithium-ion batteries have nearly twice the energy density of traditional nickel cadmiumbatteries. 31 This feature has important implications for cellphones and computers, because itmakes these items more portable for consumers. It also makes power tools easier to use and allowsworkers to use them for longer periods of time.32 Lithium-ion batteries retain no “memory” of their power capacity from previouscharging cycles. Thus they require no scheduled cycling and can be fully re-fueled to their maximumcapacity during each charging cycle. Other rechargeable battery types, in contrast, retain informationfrom previous charging cycles, which wastes valuable storage space. Over time, this makes theserechargeable batteries hold less of a charge.33 It is fragile and requires a protection circuit to maintain safe operation. A high loadcould overheat the pack and safety might be jeopardized. 34 After 2-3 years of use, the packoften becomes unserviceable due to a large voltage drop caused by high internal resistance.It should be noted, however, that manufacturers are constantly making improvements onlithium-ion batteries. 35 With such rapid progress, the use of lithium-ion batteries willcertainly expand further.
(A)The lithium-ion battery is also a low maintenance battery.
(B) Despite its overall advantages, the lithium-ion battery has its drawbacks.
(C) New and enhanced chemical combinations are introduced every six months or so.
(D)Attempts to develop rechargeable lithium-ion batteries failed due to memory problems.
(E) That is, they carry more power in a smaller unit, helping to reduce overall weight and size.(FAB) Another downside is the increase of the internal resistance that occurs with cycling and aging.
31.

參考答案

答案：E
難度：困難0.363636
統計：A(10),B(8),C(3),D(3),E(16)

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