单项选择题

序列x[n] 的z变换 X(z) 的收敛域ROC如图所示，收敛域不包含∞，则序列x[n] 是（  ）

A．右边序列
B．左边序列
C．双边序列
D．因果序列
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‎地层代号的表示方式是： +填图单位（ Nh2n）。‍<b
单项选择题
If a farmer wishes to succeed, he must try to keep a wide gap between his consumption and his production.... He may also need money to construct irrigation channels and improve his farm in other ways. If no surplus is available, a farmer cannot be ________.
A．self-confident
B．self-sufficient
C．self-satisfied
D．self-restrained
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