镀锌钢绞线用于软横跨横承力索时安全系数不应小于（）
A.2.0
B.3.0
C.4.0
D.5.0
参考答案：C
Susan's strong love for her country is __________ in her recently published poems. [ ]
A. relieved
B. reflected
C. responded
D. recovered
什么叫阴离子间隙？其正常值为多少？在评价酸碱平衡方面有何临床意义？
