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【单选题】
在螺纹道钉硫磺锚固作业中,熔制混合溶液,需放入硫磺、水泥、砂子和石蜡,下列放的入顺序中,( )是正确的。A.
先放硫磺再放砂子和水泥最后放石蜡
B.
先放砂子再放硫磺和水泥最后放石蜡
C.
先放水泥再放硫磺最后放石蜡和砂子
D.
先放砂子再放水泥最后放硫磺和石蜡
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【单选题】His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard A．wh
A.
13. His ability is beyond question; _____ has been in doubt is ____ he is prepared to work hard A．what; that
B.
which; whether
C.
what; whether
D.
that; that
【单选题】－－－ How long has he been in the army?－－－ Oh, he joined the army as far ____ as 1997. A．agoB．away
A.
13. --- How long has he been in the army? --- Oh, he joined the army as far ____ as 1997. A．ago
B.
away
C.
from
D.
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【简答题】DBS 的基础是( ),DBS的核心是( )。
【简答题】DBS的基础是( ),DBS的核心是( )。
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