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【简答题】
把苹果分成两堆,有( )种分法?分别说出怎样分。
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【简答题】A. I'm glad to hear that . B. I'd like to speak to Tracy. C. Thank you for your call 2. A. Well, that's very kind of you. What are they? B. You're welcome . C. Yes, that ’ s right . 3. A. I'd like to ...
【多选题】两段锁协议是指所有事务必须分两个阶段对数据项加锁和解锁，其中“两段”的含义指的是（ ）。
A.
在第一阶段，事务可以申请获得任何数据项上的任何类型的锁，但不能释放任何锁
B.
在第二阶段，事务可以释放任何数据项上的任何类型的锁，但不能再申请任何锁
C.
在对任何数据项进行读、写操作之前，首先要申请并获得对该数据项的封锁
D.
在释放了一个封锁之后，事务不在申请和获得任何其他封锁
【简答题】Directions: please fill in the missing word in each blank. (5 points, 1 point each) 1. F: Wow, look at this one. The colors are incredible. M: Are you kidding? It’s 1 . It looks like a lot of messy ...
【简答题】C omplete the paragraph with the words from Text B. M y wife and I used to think of it 1._________impossible to be a true friend to a total stranger. B ut years of bus trip through the city with some ...
【简答题】I ’ m sure that he will whenhe realizes what is at stake.
【单选题】听力原文：W: Listen to me, Tom. The exam has been the thing in the past．Just forget about it. M: It's easier said than done. Q: What can we learn from the conversation? (2)
A.
The exam was easier.
B.
Tom is sure that he will do better.
C.
The exam is easier than last one.
D.
Tom is afraid of failing the exam.
【简答题】根据录音内容填空: A: Sally, our first question today is from Andy. He says, “ I ’ ve just started learning English. My problem is that I ’ m too (1)_ _________ to speak. My grammar is not very good, so I (2)_...
【判断题】运行过程中可以显示参数,如输出频率(Hz)、输出电流(A)、输出电压(V)、设定频率、线速度、PID设定值、PID反馈值、电动机同步转速、通信参数等。
A.
正确
B.
错误
【单选题】下列叙述中，哪一条是不正确的?
A.
排它锁又称为X锁或写锁
B.
共享锁与任何锁都相容
C.
强两阶段封锁协议要求事务提交之前不得释放任何锁
D.
封锁自身产生的主要问题是死锁
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