关于脊髓节段的叙述正确的有()
A.共31个节段
B.颈髓有8个节段
C.胸髓有11个节段
D.腰髓有5个节段
E.骶髓有4个节段
参考答案:A, B, D
After he had a _____breakfast, he left his home ______ .
A.quick; quick
B.quickly; quickly
C.quickly; quick
D.quick; quickly
由于断路器自身原因而闭锁重合闸的是()
A、气压或油压过低
B、控制电源消失
C、保护闭锁
D、断路器漏油