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【判断题】
片虽然增加了传热面积,但是也改变了流体在的流动形势和阻力分布,泵功率的损失也会相应增加
A.
正确
B.
错误
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举一反三
【单选题】In what condition could the shop assistant exchange the product for the customer?
A.
The customer makes no more complaints.
B.
The customer can show her receipt.
C.
The customer is still unhappy with it.
D.
The customer brings it back within a week.
【单选题】Customer: Could you tell me how much this parcel to France is? Postman: ________ Anything else?
A.
Yes, please
B.
I am not sure about it.
C.
Go ahead
D.
I ’ll just check for you.
【判断题】有新的办公桌椅并且将它们安排在合适的位置就可以了,不用考虑坐着是否舒服的问题。
A.
正确
B.
错误
【判断题】传输速度是衡量数字通信系统有效性的指标
A.
正确
B.
错误
【判断题】( ) 表示数据传输有效性的指标是误码率,是衡量数据传输系统在正常工作状态下传输可靠性的参数。
A.
正确
B.
错误
【单选题】The shop could exchange the product if the customer______.
A.
makes no more complaints
B.
can produce the receipt
C.
is still unhappy with it
D.
brings it back within a week
【单选题】下面那个是正确的类的声明?( )
A.
public void HH{….}
B.
pullic class Move( ){….}
C.
public class number{ }
D.
public class Car{….}
【判断题】数字通信系统有效性的指标是传输速率,传输速率越高,有效性越好。( )
A.
正确
B.
错误
【单选题】模拟通信系统的有效性是指( )。
A.
每路信号的有效传输带宽
B.
单位时间传送的码元数目
C.
信号传输的差错率
D.
信号传输的信噪比
【单选题】Customer: Could you hold the door open for a moment, please? Salesman: Certainly. ______
A.
Please take your time
B.
I'm sorry I can't
C.
No worry, please
D.
Never mind it
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