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【简答题】
化学试剂按纯度可分为 ( )、( ) 、 ( ) 三个级别。
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【单选题】《射雕英雄传》里黄药师在面对痴恋郭靖的女儿时吟诵西汉贾谊的“天地为炉兮,造化为工。阴阳为炭兮,万物为铜”,他的意思是
A.
郭靖黄蓉二人不适合,应该分手
B.
二人的真情已无可消弭了
C.
二人有命无运,有缘无分
D.
感叹黄蓉跟她过世的母亲一样痴情
【单选题】We have decided to fulfill the task in time, difficulties we may meet with.
A.
no matter how
B.
however
C.
whatever
D.
whichever
【单选题】Are these symbolized claims equivalent? [A & (B & C)] [(A & B)& C]
A.
no
B.
yes
【简答题】_____________________(要不是停电), we would have completed the task on time.
【简答题】土地的构成要素有哪些?
【单选题】若集合A={(1,2),(3,4)},则集合A的真子集个数是(  )
A.
16
B.
8
C.
4
D.
3
【简答题】土地资源的自然构成要素有哪些?
【单选题】______ we have all the materials ready, we should begin the new task at once.
A.
Since that
B.
Since now
C.
By now
D.
Now that
【单选题】double room的中文意思是[ ].
A.
单间
B.
标间
C.
豪华套房
【简答题】Show that each of these conditional statements is a tautology by using truth tables. a) (p ∧ q) → p b) ¬ p → (p → q) c) ¬ (p → q) → p
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