定点抽查管子总数10%,合格率不少于()
A.70%
B.80%
C.90%
D.100%
参考答案:C
Could you _____the window? I feel a little cold.
A.please not open
B.please not to open
C.not please to close
D.please not to close
从仿生学观点看,通信系统是传递信息的()。
A.大脑
B.神经系统
C.传输系统
D.感受器官