If their marketing plans are changed, theirs sales by 10 percent.
A:will be increased
B:have been increasing
C:have increased
D:would be increasing
设x,y∈R,向量a→=(x,1),b→=(1,y),c→=(2,-4)且a→⊥c→,b→//c→,则|a→+b→|( )
填上适当的标点符号
敖丙他们钻出水面一看____原来是个娃娃在洗澡____用手中的红手帕搅起了一个又一个大浪____敖丙又气又急____对手下人嚷道____快去____把那个小孩儿给我杀了____