皮皮学，免费搜题
登录
搜题
【多选题】
机车车辆脱轨事故是铁路运输生产中的典型事故,防止机车车辆脱轨事故的安全措施主要有( )。A.
严格执行行车作业标准化规范
B.
认真落实非正常行车安全措施， 提高线路道岔养护质量
C.
加强信号机和轨道电路的养护
D.
加强机车车辆检修和机车出库、车辆列检的检查质量
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】Historians tend to tell the same joke when they are describing history education in America. It's the one【C1】______the teacher standing in the schoolroom door【C2】______goodbye to students for the summ...
A.
in
B.
by
C.
for
D.
about
【单选题】After singing a song, he __ us a joke.
A.
went on telling
B.
went on to tell
C.
went telling
D.
went to tell
【多选题】普鲁卡因青霉素结晶是先将青霉素钾盐溶于缓冲溶液中,冷却至 5 ~ 8 °C ,并加入适量晶种,然后滴加盐酸普鲁卡因溶液,在剧烈搅拌下就能得到普鲁卡因青霉素微粒结晶。采用的是哪些结晶法:
A.
饱和溶液冷却
B.
盐析沉淀结晶
C.
反应沉淀
D.
等电点结晶
【简答题】Tell a joke at the beginning to relax the atmosphere. _________
【单选题】Historians tend to tell the same joke when they are describing history education in America. It's the one【B1】the teacher standing in the schoolroom door【B2】goodbye to students for the summer and calli...
A.
about
B.
in
C.
for
D.
by
【单选题】When Americans tell a joke, they often ______.
A.
pat people on the head
B.
give people a hug
C.
dig people in the ribs
D.
touch people on the arm
【单选题】breach [bri:tF]
A.
n. 违背, 破坏, 破裂, 裂口 vt. 打破, 突破
B.
n. 敲打, 拍子, 巡逻区域 v. 打, 打败
C.
v. 绑, 镶边, 装订, 凝固, 约束
D.
v. 抓住, 攫住 n. 离合器
相关题目：
参考解析：
知识点：
题目纠错 0
发布
