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【单选题】
描述中数据链路层的数据单位是
A.
报文
B.
分组
C.
数据包
D.
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【单选题】下列哪个属于癌前病变
A.
子宫颈息肉
B.
十二指肠溃疡
C.
慢性浅表性胃炎
D.
病毒性肝炎
E.
粘膜白斑
【单选题】Self-test I . Language in Use Choose the appropriate word or expression to fill in each blank. She has the ability to __________ with young minds.
A.
engage
B.
participate
C.
involve
D.
evolve
【单选题】I . Language in Use Choose the appropriate word or expression to fill in each blank. 1. We should _________ oil and gas by making full use of other energy sources.
A.
  reserve
B.
conserve
C.
maintain
D.
sustain
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【判断题】Z37 摇臂钻床零压继电器可起到失压保护的作用
A.
正确
B.
错误
【判断题】集成运算放大器,当工作在线性区时,有两个特点:同相输入端电位等于反相输入端电位(称为虚短);同相输入端电流等于反相输入端电流且等于零(称为虚断)。
A.
正确
B.
错误
【判断题】当理想运算放大器工作在线性区时,同相输入端与反相输入端的电位近似相等,如同将两端短接一样,称为虚地。
A.
正确
B.
错误
【单选题】下面是对字符数组str的初始化语句,其中不正确的是( )。
A.
char str[5]={“abcd”};
B.
char str[5]={‘a’,’b’,’c’,’d’};
C.
char str[]=”abcd”;
D.
char str[5];str=”abcdef”;
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