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【单选题】
硒(Se)是人体必需的微量元素，它的一种同位素是 Se。下列有关该同位素的说法正确的是（ ）A.
质子数为80
B.
电子数为114
C.
中子数为46
D.
质量数为34
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举一反三
【单选题】Some lingnists thought that all languages ______ and were ruled by a common grammar.
A.
originated from one language
B.
started as the same language
C.
came from many different languages
D.
borrowed words from one another
【单选题】The children all turned ________ the famous actress as she entered the classroom.
A.
looked at
B.
to look at
C.
to looking at
D.
look at
【简答题】DS18B20温度检测 1.编写温度传感器函数 2.DS18B20串口显示当前温度/湿度 (用手握住DS18B20,数值明显变化)
【单选题】We all know that programming language is the system of syntax, grammar, and symbols or words used to give instructions to a computer. Because computers work with binary numbers, first-generation langu...
A.
it is used in designing software.
B.
it is hardware-independent.
C.
is should be translated into the computer language by software.
D.
it is designed to solve some specific problem.
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