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【单选题】
下列关于清洁剂的使用说法错误的是 。A.
浓缩液体清洁剂使用前必须严格按照使用说明进行稀释
B.
平时做清洁工作，注意保养
C.
为使用安全，应配备相应的防护用具。如橡胶手套
D.
清洁剂经稀释后，最好装在高压气压瓶内通过挤压使用
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举一反三
【判断题】DNA的三级结构是指DNA双螺旋进一步扭曲盘绕所形成的特定空间结构。超螺旋结构是DNA三级结构的主要形式,可分为正超螺旋与负超螺旋两大类,它们在特殊情况下可以相互转变。
A.
正确
B.
错误
【单选题】What's the"blessing of email?
A.
With email, you only deal with its message on your own time.
B.
You can't avoid all the hellos, goodbyes and other unnecessary chit-chat.
C.
It's an interactive conversation.
D.
Email isn't designed for convenience.
【简答题】船舶、设施发生交通事故,应由________查明原因,判明责任。
【简答题】It’s great to receive your email. Now I’d like to tell you something took place in my school yesterday. In the afternoon, we 小题1: _ h______ a growing-up ceremony for our coming 18-year-old ...
【单选题】The chances of the physical sciences being subject to great changes are the biggest because ______.
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in
C.
the direction of their development is difficult to predict
D.
our knowledge of the physical world is inaccurate
【单选题】The chances of the physical sciences being subject to great changes are the biggest because
A.
contradictory theories keep emerging all the time
B.
new information is constantly coming in______.
C.
our knowledge of it is highly insecure
D.
only a very small sample of it has been observed
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