齿轮齿条式动力转向系中动力缸与控制阀间有（）条油管相连。
A.一条；
B.两条；
C.三条；
D.四条。
参考答案：B
进度计划体系的第二级计划是指( )。
A．项目进度计划 B．各专业工程进度计划C．项目短周期工程综合进度计划 D．项目进度调整计划
The flight was put off due to the typhoon. Otherwise, we______ the beautiful scenery in Greece now.
A．would be enjoying
B．would have enjoyed
C．will enjoy
D．must have enjoyed
