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【多选题】
脱氧剂加入的原则是（）。A.
以脱氧为目的元素先加，合金化元素后加
B.
合金化元素先加，以脱氧为目的元素后加
C.
易氧化的贵重合金应在脱氧良好的情况下加入
D.
难熔的、不易氧化的合金应加热后加在炉内
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举一反三
【单选题】American people's idea of mastering Nature can be seen in the following activities ( ).
A.
They moved the American frontier westward.
B.
The construction of dams that hold back the waters of large rivers.
C.
The construction of tunnels that go through mountains.
D.
All of the above.
【单选题】According to the man, ______for the applicant.
A.
mastering a foreign language is necessary
B.
having ambitious ideas about future is important
C.
mastering English is very important
D.
working extra hours is required
【单选题】American people's idea of mastering Nature can be seen in the following activities ( ).
A.
They moved the American frontier westward.
B.
The construction of dams that hold back the waters of large rivers.
C.
The construction of tunnels that go through mountains.
D.
All of the other three choices are correct.
【单选题】—We’ll take the conditions into careful consideration ______ you have attached to this contract. —Thanks. Hope for further cooperation.
A.
as
B.
which
C.
where
D.
what
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