太阳能光伏发电系统的最核心的器件是（）。
A.控制器
B.逆变器
C.太阳电池
D.蓄电池
参考答案：C
年长儿心率________，新生儿心率________为胸外心脏按压的指征。
It's already 10 o'clock. I wonder how it that she was two hours late on such a short trip. [ ]
A. came over
B. came out
C. came about
D. came up
