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[单选题]
师徒两人加工一批零件,由师傅单独做需37小时,徒弟每小时能加工30个零件,现由师徒两人同时加工,完成任务时,徒弟加工的个数是师傅的 ,这批零件共有()个。
A.2060
B.2004
C.1998
D.2001
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A.2060
B.2004
C.1998
D.2001
A.2060
B.2004
C.1998
D.2001
A.1200
B.1800
C.2000
D.2100
A.1200
B.1 800
C.2400
D.3600
A. 1200
B. 1800
C. 2400
D. 3600
A.27
B.30
C.33
D.36
A.520÷(30+20)
B.(520-70)÷(30+20)
C.520÷(30-20)
A.360
B.480
C.500
D.620