设计概算文件一般应包括( )。
A．编制说明
B．封面、签署页及目录
C．总概算表
D．单项工程综合概算表
E．单位工程综合概算表
参考答案：A,B,C,E
五个数，x，y，z，5和7，他们的算术平均值(mean)等于8，问下面哪一个正确 (Ⅰ)The range of the five numbers is 2 or more. (Ⅱ)At least one of x，y，z is more than 9.
Private cars really provide much convenience to people, and ___ they cause too many problems.
A．meanwhile
B．therefore
C．otherwise
D．instead
