实物转移可以保证人们获得足够的营养。
参考答案：错
The number of the students in our grade _______about ______，and of them are girls.
A．are, six hundreds, two- thirds
B．is, six hundred, two- third
C．is, six hundred, two thirds
D．are, six hundreds, two third
阀控铅酸蓄电池在线工作时，应经常处在（）状态。
A．恒流充电
B．均衡充电
C．全浮充
