题目内容
在SQL中，涉及空值的+，－，*、/运算中，有一个操作数为空值时，结果为( )。
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The lady in this strange-tale very obviously suffers from a serious mental illness. Her plot against a completely innocent old man is a dear sign of ______.
When he finally emerged from the cave after thirty days, John was ______ pale.
在督导过程中，督导不需要付费的是( )。
为锁定的工具箱进行解锁，应按( )键。
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