下列各项中，能够引起现金流量净额发生变动的是（    ）。

(单选题)2016年，北京市常住人口中非外来人口为多少万人？（ ） (单选题)( ) if I had arrived yesterday without letting you know b (单选题)The opening ceremony is a great occasion. It is essential ( (单选题)Quality is ( ) counts most. (单选题)The government has promised to do ( ) lies in its power t (单选题)If not ( ) with the respect he feels due to him, Jack get (单选题)Time ( ), the celebration will be held as scheduled. (单选题)Miss Smith and I keep in touch ( ) writing often. (单选题)During the summer vacation, kids are often seen hanging ( (单选题)The first two stages in the development of civilized man wer