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【单选题】
对于热塑性塑料,要提高制品的刚性,尺寸稳定性,防止蠕变,改善润滑性,可加入( )作为填充剂。A.
碳酸钙
B.
滑石粉
C.
白碳黑
D.
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举一反三
【单选题】STCW78/95 states that the officer in charge of the engineering watch is the _____ representative.
A.
、 ship-owner’s
B.
、 master’s
C.
、 chief engineer’s
D.
、 manager’s
【单选题】STCW78/95 states that the officer in charge of the engineering watch is the ___ presentative.
A.
ship-owner's
B.
master's
C.
chief engineer's
D.
manager's
【单选题】STCW78/95 states that the officer in charge of the engineering watch is the representative.
A.
shipowner's
B.
master's
C.
chief engineer' s
D.
manger's
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