根据调管范围的划分,广东电力系统调度操作模式可分为()
A.直接操作
B.委托操作
C.配合操作
D.转令操作
E.许可操作
参考答案:A, B, C, D, E
In the spoken English of some areas in the US, the "r" sounds at the end of the words ___ . [ ]
A. are dropped
B. drop
C. are being dropped
D. have dropped
急性肾小球肾炎的常见致病菌是
A.溶血性链球菌B.葡萄球菌C.肺炎链球菌D.柯萨奇病毒BE.草绿色链球菌