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It was ____ he saw the doctor coming out of the emergency room with an expression as grave as a judge ____ he realized the seriousness of his wife's illness.（ ）
本题考察it is not until...that...结构的用法。
给定曲线y=x3与直线y=px-q(其中p>0)，求P与q为何关系时，直线y=px-q是y=x3的切线.
y”-2y′-3y=O的通解是.
yInxdx+xInydy=0的通解是.
