各类作业人员在发现直接危及人身、电网和设备安全的紧急情况时，有权_____或者在采取可能的_____后撤离作业场所，并立即报告。
参考答案：停止作业;紧急措施
阅读短文，然后判断正(T)误(F)。
I have two friends. This is Jenny. She is a girl. She lives in Canada. She is eight. She is my friend. And
this is Li Ming. He is a boy. He is nine. He lives in China. He is my friend, too.
( ) 1. I have 5 friends.
( ) 2. Jenny is 8.
( ) 3. Li Ming is a boy.
( ) 4. Jenny lives in China.
( ) 5. Li Ming is 7.
( ) 6. Li Ming lives in Canada.
在长度为n的线性表中查找一个表中不存在的元素，需要的比较次数为 (47) 。
A) n B) n-1 C) n+1 D) 2n
