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【判断题】
洼地是带岩溶作用下的产物，也是岩溶作用中期的地貌标志。A.
正确
B.
错误
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皮皮学刷刷变学霸
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A.
2NH 3 ＋ 3CuO == =3Cu ＋ N 2 ＋ 3H 2 O
B.
8NH 3 ＋ 3Cl 2 == =6NH 4 Cl ＋ N 2
C.
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D.
NH 3 ＋ HCl == =NH 4 Cl
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【单选题】If you don't understand a section of mathematics text, ______.
A.
it is no use going on to other subjects
B.
it is no use going on to the next section
C.
you can not go on studying physics
D.
you can go on studying chemistry
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