皮皮学，免费搜题
登录
搜题
【简答题】
某车站售票厅，任何时刻最多可容纳20名购票者进入，当售票厅中少于20名购票者时，则厅外的购票者可立即进入，否则需在外面等待。若把一个购票者看作一个进程，请回答下列问题。 根据所定义的信号量，把应执行的PV操作填入下述方框中，以保证进程能够正确地并发执行。
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
.
..
皮皮学刷刷变学霸
举一反三
【简答题】阅读理解。 Harry keeps a diary. He writes in it every day. Here is his diary for a week in May. Monday 15th It rained all day so we did not have PE class. We stayed in our classroom and read our books. Tue...
查看完整题目与答案
【单选题】听力原文：W：I'm sorry．I came back in hurry and forgot to buy the birthday cake． M：I told you it is our son's birthday today and he likes cakes．You said you would get him one． Q：What do we learn from this c...
A.
The woman came back late.
B.
The woman didn't bring the man a gift.
C.
The woman forgot to buy a birthday cake.
D.
The woman forgot to come to the birthday party.
查看完整题目与答案
【判断题】非正规开采是比较原始落后、非常危险的采煤方法，如巷道式、房柱式、仓储式等，一般没有形成全风压通风系统，没有2个安全出口，没有可靠支护，以掘代采，极易发生事故或造成事故扩大。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Bob’s Travel Diary(旅游日记) Tuesday, July 16th Today is rained ,so we went to a museum(博物馆).It was 36 boring. I found(发现) a small boy 37  in the corner. He was lost( 迷路) and I helped him find 38 father. ...
查看完整题目与答案
【单选题】听力原文：W: I wonder if you have time to go to the food store today. We have almost run out of bread. M: You'd better do that. I haven't got my report ready yet, but my boss needs it tomorrow. Q: Why isn'...
A.
He has some work to do.
B.
The woman is going to do that.
C.
His boss is coming to see him.
D.
He doesn't feel like eating any bread today.
查看完整题目与答案
【多选题】城市生活饮用水的处理中()是去除地表水中浑浊物质最常用的处理方法。
A.
筛网
B.
混凝
C.
絮凝
D.
消毒
查看完整题目与答案
【多选题】扩口成形方法通常有( )
A.
手动成形
B.
扩口机成形
C.
冲压扩口成形
D.
旋压扩口成形
查看完整题目与答案
【简答题】完形填空。 Some scientists say our clothes are so powerful that they can change our feelings. 16 , we can control our feelings 17 different colors of clothes. Normally when we are sad, we will wear d...
查看完整题目与答案
【多选题】变顾客为销售力量的常用方法包括:
A.
激发顾客谈论你的优质服务
B.
通过“感谢”推荐人计划形成扩大口碑相传的机制
C.
对所有的顾客进行促销活动
D.
营造“热议活动”（buzz campaign）
查看完整题目与答案
【单选题】有关男西裤虚拟缝合的描述正确的是( )
A.
腰头部位的纽扣订在左裤片的上面
B.
腰头省褶缝合时，折向里面的角度为0°
C.
先缝合腰省，再缝合腰头
D.
先跳过省褶缝合腰头，然后再处理省褶
查看完整题目与答案
相关题目：
【简答题】阅读理解。 Harry keeps a diary. He writes in it every day. Here is his diary for a week in May. Monday 15th It rained all day so we did not have PE class. We stayed in our classroom and read our books. Tue...
查看完整题目与答案
【单选题】听力原文：W：I'm sorry．I came back in hurry and forgot to buy the birthday cake． M：I told you it is our son's birthday today and he likes cakes．You said you would get him one． Q：What do we learn from this c...
A.
The woman came back late.
B.
The woman didn't bring the man a gift.
C.
The woman forgot to buy a birthday cake.
D.
The woman forgot to come to the birthday party.
查看完整题目与答案
【判断题】非正规开采是比较原始落后、非常危险的采煤方法，如巷道式、房柱式、仓储式等，一般没有形成全风压通风系统，没有2个安全出口，没有可靠支护，以掘代采，极易发生事故或造成事故扩大。
A.
正确
B.
错误
查看完整题目与答案
【简答题】Bob’s Travel Diary(旅游日记) Tuesday, July 16th Today is rained ,so we went to a museum(博物馆).It was 36 boring. I found(发现) a small boy 37  in the corner. He was lost( 迷路) and I helped him find 38 father. ...
查看完整题目与答案
【单选题】听力原文：W: I wonder if you have time to go to the food store today. We have almost run out of bread. M: You'd better do that. I haven't got my report ready yet, but my boss needs it tomorrow. Q: Why isn'...
A.
He has some work to do.
B.
The woman is going to do that.
C.
His boss is coming to see him.
D.
He doesn't feel like eating any bread today.
查看完整题目与答案
【多选题】城市生活饮用水的处理中()是去除地表水中浑浊物质最常用的处理方法。
A.
筛网
B.
混凝
C.
絮凝
D.
消毒
查看完整题目与答案
【多选题】扩口成形方法通常有( )
A.
手动成形
B.
扩口机成形
C.
冲压扩口成形
D.
旋压扩口成形
查看完整题目与答案
【简答题】完形填空。 Some scientists say our clothes are so powerful that they can change our feelings. 16 , we can control our feelings 17 different colors of clothes. Normally when we are sad, we will wear d...
查看完整题目与答案
【多选题】变顾客为销售力量的常用方法包括:
A.
激发顾客谈论你的优质服务
B.
通过“感谢”推荐人计划形成扩大口碑相传的机制
C.
对所有的顾客进行促销活动
D.
营造“热议活动”（buzz campaign）
查看完整题目与答案
【单选题】有关男西裤虚拟缝合的描述正确的是( )
A.
腰头部位的纽扣订在左裤片的上面
B.
腰头省褶缝合时，折向里面的角度为0°
C.
先缝合腰省，再缝合腰头
D.
先跳过省褶缝合腰头，然后再处理省褶
查看完整题目与答案