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【单选题】
郊游时,看见野生蘑菇,您应该怎么做?
A.
采下来带回家食用
B.
凭经验判断无毒的就可带回家食用
C.
咨询他人后感觉食用
D.
野生的蘑菇不安全,不采摘也不食用
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【单选题】听力原文: The U.S. Space Agency NASA says Russia's orbiting Mir space station has lost its primary and backup oxygen sources. If the problem is not fixed, the 3-mernber crew would have to abort the missio...
A.
It has lost its primary oxygen sources.
B.
It has lost its backup oxygen sources.
C.
It has lost both the primary and the backup oxygen sources.
D.
It has lost neither the primary or the backup oxygen sources.
【单选题】TCP协议是面向字节流的协议,其特点是( )。
A.
TCP协议不要求主机维护复杂的状态表
B.
接收方收到的数据块和发送方发出的数据块大小可能不相同
C.
接收方的TCP每次向应用层交付一个完整的报文
D.
TCP协议知道所传输的数据块的含义
【判断题】使能定时器1中断的语句是T1IE=1;
A.
正确
B.
错误
【单选题】设置定时器T1中断使能的指令语句是:( )。
A.
IT1=1;
B.
ET1=1;
C.
TF1=1;
D.
EX1=1;
【单选题】听力原文: The U.S. Space Agency NASA says Russia's orbiting Mir space station has lost its primary and backup oxygen sources. If the problem is not fixed, the 3-member crew would have to abort the mission...
A.
It has lost its primary 6xygen sources.
B.
It has lost its backup oxygen sources.
C.
It has lost both the primary and the backup oxygen sources.
D.
It has last neither the primary or the backup oxygen sources.
【单选题】三相鼠笼式异步电动机用自耦变压器降压启动时,若自期变压器受比K=N1/N2=10/7,电动机的转矩是全压启动转矩的( )
A.
35%
B.
49%
C.
56%
D.
70 %
【单选题】TCP协议是面向字节流的协议,其特点是()
A.
接收方收到的数据块和发送方发出的数据块大小可能不相同
B.
接收方的TCP每次向应用层交付一个完整的报文
C.
TCP协议知道所传输的数据块的含义
D.
TCP协议不要求主机维护复杂的状态表
【单选题】isual FoxPro软件属于( )。
A.
数据库系统
B.
数据库管理系统
C.
数据库应用系统
D.
数据库
【单选题】The design of the orbiter indicates
A.
NASA's determination to continue space exploration.
B.
NASA's disadvantage in space technology.
C.
the great pressure from Congress on NASA.
D.
a heavy defeat for NASA.
【单选题】下面的语句哪个是设置定时器0的中断使能的( )。
A.
EX0=1
B.
EA=1
C.
ES0=1
D.
ET0=1
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