【单选题】During the examination we are required to stay in our seats, keep our eyes on our work, ____ to anyone.
【单选题】.During the test we were supposed to stay in our seats , keep our eyes on our work , ___________to anyone .
【单选题】Our keys to the gate were ____ to our neighbours during our absence. [ ]
【判断题】钠灯有一定的使用寿命,连续使用一般不超过4h,亦不准瞬间内反复开关。
【单选题】During the examinations we are supposed to remain in our seats, fix our eyes on the papers, _____to anyone.
【判断题】4 钠灯有一定的使用寿命,连续使用一般不超过4h,亦不准瞬间内反复开关。