题目

Pocket Tape-Recorders “Family and Home Magazine” test what’s on the market now.  1）Pearlcorder S702 $64 This simple model at the bottom of the Olympus range scored the most points for its excellent quality of recording. Background noise hardly affects the sound and recording from a pocket is perfectly possible, but it doesn’t turn off automatically. Tape length: 30 minutes per side. Weight: 240g. 2）Sony M9 $49.95 Small and very good looking, sony’s latest offering scored most for appearance. Sounds clear, but there is slight machine noise. The big control buttons are a 近年来我国一些城市陆续投入使用电动汽车充电桩，表明新能源汽车的推广和使用得到了快速的发展．下图是直流充电桩为电动汽车进行充电的情景（图甲）及直流充电桩的主要技术参数（图乙）．（1）请写出电动汽车具有的一项优点________．（2）直流充电桩给电动汽车充电时将电能转化为________能贮存在电动汽车的蓄电池内．（3）车主可以选择不同的输出电压和输出电流对汽车充电，根据该直流充电桩的技术参数，计算该直流充电桩充电时的最大输出功率．