.目前世界上共142部宪法中有（）部宪法规定了国语或官方语言。
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低沸塔顶或塔底温度控制过低，容易导致单体中乙炔含量增大（）
A. 正确
B. 错误
Which statements describe the capabilities of the DBMS_NETWORK_ACL_ADMIN package?（）
A. It can be used to allow the access privilege settings for users but not roles.
B. It can be used to allow the access privilege settings for users as well as roles.
C. It can be used to control the time interval for which the access privilege is available to a user.
D. It can be used to selectively restrict the access for each user in a database to different host computers.
E. It can be used to selectively restrict a user's access to different applications in a specific host computer.
出口信用保险项下融资净额不超过该笔应收账款票面金额的（），且不得超过该笔应收账款的保单赔付金额。
A. 60%
B. 70%
C. 80%
D. 90%
2010年8月，重庆剪纸与河北、陕西等地剪纸作为中国剪纸联合申报非物质文化遗产项目。重庆剪纸主要是以什么为代表？
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