The student was at________loss when________word came that he would be asked to come to

the office and explain his reason for being late for school. [ ]

A. a；the

B. /；/

C. the；the  

D. a；/

灌注桩，其桩身强度为其截面面积与混凝土轴心抗压强度设计值之积，再乘以折减系数φc，φc取下列哪一数值是正确的()

A．1．0

B．0．95

C．0．85

D．0．65