有抗冻要求的港口与航道工程混凝土粗骨料中总含泥量的限制值为（）。
A．≤0.5%
B．≤0.7%
C．≤1.0%
D．≤2.0%
参考答案：B
28. He raised a suggestion at the meeting, ____ well worth considering.
A．which I think is
B．which I think it is
C．I think is which
D．I think it is
许多企业通过实施一系列的顾客导向是从而实现利润增长和市场份额扩大的举措有哪些？
