题目
A.0~25毫米
B.25~50毫米
C.50~75毫米
D.大于25毫米
第7题
A.120.037-120.059,0.04-0.09
B.120.020-120.059,0.04-0.09
C.120.037-120.059,0.01-0.04
D.120.020-120.059,0.01-0.04
第9题
A.a=0.21131
B.a=0.22031
C.a=0.22321
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