临修转向架故障修理标准:心盘磨耗盘丢失时补装,破损或裂纹超限时更换,心盘磨耗盘允许有 发布时间:2021-02-21 23:06 │ 来源:www.tikuol.com 题型:单项选择题 问题: 临修转向架故障修理标准:心盘磨耗盘丢失时补装,破损或裂纹超限时更换,心盘磨耗盘允许有1处从周边至中心销孔的裂纹或()处以上长度之和不大于150mm的裂纹。A.1B.2C.3D.4
题型:单项选择题 关于人类沙门菌感染肠炎型(食物中毒),叙述不正确的是()A.是最常见的沙门菌感染,由摄入大量鼠伤寒沙门菌、猪霍乱沙门菌等污染的食物引起B.主要症状为发热、恶心、呕吐、腹痛、腹泻,一般3~5天内较快恢复C.潜伏期6~24小时D.常为集体性食物中毒E.病后多见带菌者 查看答案
题型:单项选择题 根据句意,用括号中所给单词的适当形式填空,每空一词。小题1:Jim fell down from the tree yesterday. Luckily, he didn’t hurt (he).小题2:— When is Teachers’ Day, do you know?—Sure! It’s in the (nine) month of a year.小题3:The sun shines brightly in the sky. It,s a (sun) day today.小题4:Mom is busy cooking in the kitchen. She,s (prepare) a cake for my birthday party.小题5:In fall, (leaf) fall down from the trees. The cold weather is coming. 查看答案