工程分包合同协议书中分包人应向承包人承诺，履行总包合同中与分包工程有关的承包人的( )义务。
A．连带
B．部分
C．双方协商的
D．所有
参考答案：D
----- Mary looks very upset. She _______ failed to pass the exam.
----- I guess so. It's very difficult after all.
A must have B could have C should have D might have
推动网络由传统管道向智能管道转变，实现（）。
A.用户可识别，
B.业务可区分，
C.质量可控制，
D.网络可管理
