What’s the advantage when using the satellites?（）

A.The message can be directed to the desired location

B.The message can follow the earth‟s curvature

C.The quality of message can not be affected by climatic

D.the range of the message extend and the quality of reception is improved

目前国际上通行的一国政府债务风险的警戒线指标是______。

A．赤字率不得超过3%，公共部门债务率不得超过GDP的60%

B．赤字率不得超过5%，公共部门债务率不得超过GDP的45%

C．赤字率不得超过10%，公共部门债务率不得超过GDP的50%

D．赤字率不得超过8%，公共部门债务率不得超过GDP的55%