某堆栈的输入序列为1,2,3,4的4个序列中,()不可能是它的输出序列。
A. 1,3,2,4
B. 2,3,4,1
C. 4,3,1,2
D. 3,4,2,1
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若堆栈采用顺序存储结构,正常情况下,删除堆栈中一个元素,栈顶指针TOP的变化是()。
A. 不变
B. TOP=0
C. TOP=TOP+1
D. TOP=TOP-1
The former Soviet state of Georgia today exhibits a diversified economy.
A. a multifaceted
B. a sagging
C. a dissolving
D. an improved
He goes shopping so frequently not because he is rich, but because he enjoys ______ politely.
A. speaking
B. being spoken to
C. being spoken
D. speaking to
To cream a circuit, a conducting wire is attached to an electric cell at one end, and to an electric outlet at the other.
A. battery
B. faucet
C. socket
D. appliance