下列关于中国矿产资源的描述，不正确的是( )。

A．铁主要分布于辽宁、内蒙古和川西
B．煤主要分布在华北、西北、东北和西南区，其中以山西、内蒙古、新疆等地最集中
C．钨矿在19个省区均有分布，储量主要集中在湘东南、赣南、粤北、闽西和桂东一桂中
D．我国铝土矿分布高度集中，山西、贵州、河南和广西四个省(区)的储量合计占全国总储量的90.9%

With hundreds of millions of electronic transactions taking place daily, businesses and organizations have a p incentive to protect the (66) of the data exchanged in this manner, and to positively ensure the identities of those involved in the (67) . This has led to an industry-wide quest for better, more secure methods for controlling IT operations, and for deploying p security (68) deeply and broadly throughout networked infrastructures and client devices. One of the more successful concepts to engage the imaginations of the security community has been the development of standards-based security. (69) that can be incorporated in the hardware design of client computers. The principle of encapsulating core security capabilities in (70) and integrating security provisions at the deepest levels of the machine operation has significant benefits for both users and those responsible for securing IT operations.

A．operations

B．homogeneities

C．creations

D．mechanisms