大阿拉伯自由贸易区中阿拉伯贸易及其余国家实行哪些条款()。
A、海关税费要求
B、产地要求
C、私营部门
D、通讯
E、关税
参考答案:A, B, C, D, E
多孔性吸声材料的原理
--- What has become of the spaceship?
-- It landed ______.
A.safely but broken
B.safe but has broken
C.safely but was broken
D.safe but broken