Many people prefer large cars, _____large cars are safer than small ones.

A．thinking

B．to think

C．think

D．having thought

依据《协调统一基建类和生产类标准差异条款》国家电网科〔2011〕12号文协调方案新建工程中为减少设备品种，建议Ⅲ、Ⅳ、Ⅴ类电流互感器准确精度统一选用（）级。