堆放时钢筋下面要加垫木,离地不宜少于()mm,以防钢筋锈蚀和污染。
A.50
B.200
C.500
D.600
参考答案:B
Soon after getting off his horse, the man appeared at the second storey windows, __ he could see nothing but trees.
A.from which
B.from where
C.in where
D.which
患者,女性,31岁。6天前足月经 * * 分娩一男婴,体重4250g,4天前出现不能控制的 * * 排液。
为明确诊断需行的检查是()
A.宫腔镜检查
B.靛胭脂试验
C.亚甲蓝试验
D.排泄性尿路造影
E.肾显像