若发包人未按合同约定预付工程款，承包人应在预付时间到期后( )d内向发包人发出要求预付的通知。
A．7 B．10C．14 D．15
参考答案：B
The young man used to _______ to work,but he is used to _______to work now.
A．drive,walking.
B．drove,walked.
C．drive,walks.
D．driving,walk
水路系统在（）Mpa压力下无漏水现象。
A、0.1
B、0.2
C、0.3
