联合国的重要机关有大会、()、经济及社会理事会、()、()、秘书处。
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瘢痕性类天疱疮在口腔中病损的最常见部位是（）
A. 牙龈
B. 下唇
C. 软腭
D. 上腭
E. 颊黏膜
During the manufacture of line，yarns are twisted together in the（）.
A. opposite direction from which the fibers are twisted together to form strands
B. same direction the fibers are twisted to form strands
C. opposite direction from which the fibers are twisted together to form the line
D. opposite direction from which the fibers are twisted together forming cable
国际企业文化的层次结构包括心理层次、制度层次、（）。
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