道化学公司(第七版)中物质系数MF是由()决定的。
A、物质可燃性Nf;
B、化学活泼性Nr;
C、物质毒性系数Nh。
参考答案:A, B
要求当鼠标在图片框Pl中移动时,立即在图片框中显示鼠标的位置坐标。下面能正确实现上述功能的事件过程是______。
A) Private Sub Form_MouseMove(Button As Integer,Shift As Integer,X As Single,Y As Single) P1.Print X,Y End SubB) Private Sub P1_MouseMove(Button As Integer,Sluft As Integer,X As Single,Y As Single) P1.PrintX,Y End SubC) Private Sub P1_MouseMove(Button As Integer,Shift As Integer,X As Single,Y As Single) Print X,Y End SubD) Private Sub P1_MouseDown(Button As Integer,Shift As Integer,X As Single,Y As Single) Picture,Print X.Y End Sub
某商品流通企业某种商品前10个月的实际销售量如下表所示。若第10个月的销售量预测值为579,取a=0.8,用一次指数平滑法预测第11月的销售量()吨.
A.555.8
B.546.5
C.533.4
D.528.8