【单选题】Sometimes it is not so easy to tell the right the wrong.
【单选题】It is not so easy to take the money out of a piggy bank as to put the money in.
【单选题】It can be easy to _______ such bad habits as smoking and heavy drinking, but it is not so easy to quit.
【单选题】It is not so easy to make clear the shifting ______ within a large family.
【单选题】利用光栅的( )作用,可以进行色散分光 。
【简答题】It is not so easy to make a nutritious breakfast.
【判断题】若要求多项式P和Q的商的导函数,可以用语句p=polyder(P,Q)来实现。