【简答题】We had the (impress)___________ that the contract was surely ours if we wanted it.
【单选题】下图所示的锂离子电池主要利用碳的还原和氧化进行工作,比传统的镉镍电池、氢镍电池性能更优越。则下列叙述正确的是 [ ]
B.
该电池充放电的总反应式为: LiCoO 2 +C 6 Li 1-x CoO 2 +Li x C 6
C.
放电时A极是负极,C 6 X- 发生氧化反应
【简答题】(词性) We had the (impress)____that the contract was surely ours if we wanted it.
【单选题】铅蓄电池和镉-镍蓄电池相比较,下列说法正确的是 。
A.
铅蓄电池的外壳不带电,而镉-镍蓄电池的金属外壳带点
C.
铅蓄电池的容量成本比(容量/成本)要比后者高得多
D.
铅蓄电池的外壳带电,而镉-镍蓄电池的金属外壳不带点