()装置必须与提升机的控制回路闭锁。
A.井口信号
B.井底信号
C.备用信号
参考答案:A
She prefers the sofa made of real leather although it costs more than that made of ______ leather.
A.fascinating
B.permanent
C.artificial
D.conventional
肾综合征出血热的"三大"主征()
A.出血,休克,肾损害
B.发热,休克,少尿
C.发热,出血,肾损害
D.发热,出血,"三痛"
E.休克,少尿,"三痛"