下列设备断电流程排序正确的事是()。①供电设备断电②配电设备断电③受电设备断电
A、①③②
B、①②③
C、③②①
D、②①③
参考答案:C
This year they have produced___grain___they did last year.
A.as less; as
B.as few; as
C.less; than
D.fewer; than
我们吃的面粉主要来自于小麦种子的( )
A.胚乳
B.子叶
C.胚芽
D.胚轴