税务领域信用建设要建立（）。
A.企业信用评价体系
B.信用分类管理和联合监管制度
C.信用信息统一平台
D.跨部门信用信息共享机制
参考答案：D
不透明瓷一般不是用作（）
A.增加瓷层亮度
B.遮盖金属色
C.瓷金化学结合
D.形成金瓷冠基础色调
E.增加颜色饱和度
An aircraft has indicated that he wants you to change course and follow him. You cannot comply because of an emergency on board. Which signal should you make?（）
A.Fire a red flare at night or a red smoke signal by day
B.Send the Morse signal N by flashing light
C.Make a round turn (360°) and resume course
D.Make an S turn (hard right then hard left) and resume course
