A.中國(guó)規(guī)范 B.歐洲規(guī)范 C.項(xiàng)目承包合同中約定的規(guī)范 D.美國(guó)規(guī)范
A.15米B.10米C.5米D.0米
A.550-451 B.450-351 C.350-251 D.≤250