With the help of high technology, in the past few years, electronic business __________          to bank industry, travel industry.

A．applied

B．have applied

C．had been applied

D．has been applied

推出机构的确定依据是尽量将塑件留在动模上、保证制品不变形不损坏、结构可靠和（）。

A、保证尺寸

B、保证精度

C、结构复杂

D、保证塑件外观质量