依据有关法律、行政法规和规章的规定,道路危险货物运输经营者()投保承运人责任保险。
A.自愿
B.根据需要和实际情况
C.必须
参考答案:C
预制构件混凝土的工程量按( )计算。
A.实际体积以立方米
B.构件高度以米
C.构件长度以米
D.构件表面积以平方米
She is _______ you could ever meet.
A.as a gentle girl as
B.as gently a girl as
C.a girl as gentle
D.as gentle a girl as