A.make sure
B.be sure
C.assure
D.believe
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A.in duplicate
B.in double
C.at twice
D.for two
A.to reduce
B.to increase
C.and reduce
D.and increase
A.shim
B.gasket
C.washer
D.packing
A.lead
B.forged steel
C.alloy steel
D.aluminum alloy
A.cast iron
B.forged steel
C.stainless steel
D.aluminum alloy
最新試題
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