【单选题】【消耗次数：1】
下列关于S房的说法中正确的是（）。
①
S房=S底+S结
②
S房=S底-S结
③
S房=S结-S底
④
S房与S结和S底没有关系
参考答案：
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相关题目
【单选题】
文法G【S】=（{b}，{S，B}，S，{S→b│bB，B→bS}），该文法所描述的语言____。
①
L(G[S])={b2i+1│i≥0}
②
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③
L(G[S])={bi│i≥0}
④
L(G[S])={b2i│i≥0}
【单选题】
若有变量说明：chars，s1[20]；执行语句：s=student；s1=s；正确的叙述是：（）。
①
二个语句都不正确
②
s所指向的字符串和s1的值都是student
③
第一个语句正确，而第二个语句不正确
④
第二个语句正确，而第一个语句不正确
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关于奈氏判据及其辅助函数F(s)=1+G(s)H(s)，错误的说法是（）
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F(s)的零点就是开环传递函数的极点
②
F(s)的极点就是开环传递函数的极点
③
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④
F(s)的零点就是闭环传递函数的极点
【单选题】
若REPLACE（S，S1，S2）表示用字符串S2替换字符串S中的子串S1的操作，则对于S=“Beijing＆Nanjing”，S1=“Beijing”，S2=“Shanghai”，REPLACE（S，S1，S2）=（ ）。
①
“Nanjing＆Shanghai”
②
“Nanjing＆Nanjing”
③
“ShanghaiNanjing”
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“Shanghai＆Nanjing”
随机题目
【单选题】
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②
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④
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