煤矿窄轨铁路道岔标准中,在尖轨顶面宽20mm处与基本轨高低差不大于()。
A.1mm
B.2mm
C.3mm
D.4mm
参考答案:B
有关巨细胞病毒感染的孕妇治疗措施,下列哪项是错误的()
A.孕早期,立即行人工流产终止妊娠
B.妊娠20周时抽羊水检查特异性IgM
C.妊娠20周时取脐血检查特异性IgM
D.妊娠晚期无须特殊处理
E.即使乳汁中检测出巨细胞病毒的产妇,亦可母乳喂养
用所给单词的正确形式补全句子。
1. I (give) one apple to my dog yesterday.
2. My mum's _ (China) rice is very nice.
3. She (not) like hamburgers.
4. Please go to school in two (day) time.
5. My mother is a (teach).