氧气呼吸器达到额定防护时间后，若氧气瓶内还有氧气，可以继续使用。
参考答案：错
— Do you know our town?
— No, this is the first time I____here. [ ]
A. was
B. are coming
C. came
D. have come
C语言中逻辑表达式的值为 ( )
A．0或1 B．非零值或者零值C．ture或false D．'ture'或者'false'
