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【简答题】
什么是NULL值?它与数值0有何区别?
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【简答题】阅读短文，判断下列句子正(T)误(F)。 It is the first day of school. Sam wants to go back to school. He wants to see his friends. He wants to meet his new teacher. Sam gets up at six in the morning. He washes his face...
【简答题】如果移去一段DNA将会干扰染色体的分离，而重新插入这段序列又可恢复染色体分离的稳定性，则该DNA序列一定位于着丝粒之外。
【多选题】在单轨编辑模式下，如何操作可以在波形上确定一段编辑区域（）？
A.
按住鼠标右键拖动选中编辑区域
B.
按住鼠标左键拖动选中编辑区域
C.
在选择/查看面板中的查看输入框，输入编辑区域的开始时间、结束时间以及时间长度等信息来确定编辑区域。
D.
在选择/查看面板中的选择输入框，输入编辑区域的开始时间、结束时间以及时间长度等信息来确定编辑区域。
【简答题】阅读短文，判断下列句子正(T)误(F)。 Tom is a very clever boy. He studies in Yucai School. He is tall and thin. But his classmate, Lili, is taller than him. Lili is active and beautiful. They all love their English t...
【简答题】阅读短文，判断下列句子正(T)误(F)。 Tom is seven, he goes to school every day. The school is next to his home, so he goes there on foot and comes back home on time. But today he is late. His mother asks him, 'Why ar...
【简答题】MIDAS软件的安装方法?
【单选题】以下关于 MIDAS GTS软件单位系统的描述正确的是( )
A.
未指定单位，用户自行保证单位统一
B.
采用固定的单位系统
C.
用户在分析前可选择单位系统，建模中不可转换
D.
用户在分析前可选择单位系统，建模中可转换
【简答题】阅读短文，判断下列句子正(T)误(F)。 Li Ming wants to buy gifts for his mum and his cousin in China. He goes to a shop downtown. There are many buses downtown. He buys two dresses for his cousin and some dishes for h...
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