在 Oracle 中,下面哪条语句当 COMM 字段为空时显示 0,不为空时显示 COMM 的值 ()。
A. SELECT ename, NVL(comm, 0) FROM emp;
B. SELECT ename, NULL(comm, 0) FROM emp;
C. SELECT ename, NULLIF(comm, 0) FROM emp;
D. SELECT ename, DECODE(comm, NULL, 0) FROM emp;
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10．货币供给增加将（ ）
A．使IS曲线左移，并使利率和收入水平同时降低；
B．使IS曲线下移(右移)，同时提高利率和收入水平；
C．使LM曲线右移，提高收入水平但降低利率；
D．使LM曲线下移(右移)，提高收入水平但降低利率。
The lunatic who was beyond ______ was sent to a mental hospital.
A. restrain
B. restrained
C. restraining
D. restraint
All these factors contribute to his ______ to the Darwinian theory of evolution.
A. conversion
B. reversion
C. diversion
D. subversion
The jailed Christian ______ was recently released after the intense campaign by international diplomatic mission.
A. convert
B. conversion
C. convertible
D. convertibility
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