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氯气急性中毒可引起中、重度昏迷、支气管哮喘、严重窒息还会出现严重并发症，如气胸、纵隔气肿等，因此在使用氯气时要做到()。A.
在氯气气瓶附近安装气体泄漏报警装置
B.
使用者佩戴防毒面具
C.
定期检查是否漏气
D.
确保在使用时过量的氯气进行无害化吸收
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举一反三
【单选题】Days are longer __________ summer than __________ winter.
A.
in;in
B.
in;on
C.
from;to
【单选题】Museums in the Modern World 1.Museums have changeD．They are no longer places for the privileged few or for bored vacationers to visit on rainy days. Action and democracy are words used in descriptions...
A.
Causes of changes
B.
Increasing number of museums and visitors
C.
Museums getting closer to more spectators
D.
Movies shown in museums
E.
New notions about, the management of museums
F.
Places to visit
【单选题】Which one is the topic sentence? ( 1 ) The 19th-century American philosopher Henry David Thoreau was famous for saying, “ Simplify, simplify. ” ( 2 ) Unfortunately, the trend these days seems to be “ ...
A.
1
B.
3
C.
5
D.
7
E.
9
F.
10
【简答题】硬链接只能建立对 链接。符号链接可以跨不同文件系统创建。
【简答题】轻蔑,鄙视,看不起 n./v.
【简答题】根据首字母或汉语写出正确的英语单词 10% 小题1:The fifth day of a week is T________________. 小题2:I called you last night, b____ there was no reply. 小题3:September is the n_________ month of the year. 小题4:Did you visit any ...
【简答题】n. 轻视,轻蔑,鄙视
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