题目内容

IncommonImperialandUScustomaryunitsoflength,1foot(ft, = 12in)=_______m.

A. 0.2048
B. 0.3048
C. 0.5048
D. 0.7048

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IncommonImperialandUScustomaryunitsoflength,1yard(yd, = 3feet)=_______m.

A. 0.61
B. 0.81
C. 0.91
D. 1.1

IncommonImperialandUScustomaryunitsoflength,1 mile (mi, = 5,280 ft or 1,760 yd) = ___________m.

A. 1,209.344
B. 1,409.344
C. 1,609.344
D. 1,809.344

1 quantum chromodynamics (QCD) unit of length= ___________________ m.

A. 2.103×10^−14
B. 2.103×10^−16
C. 2.103×10^−18
D. 2.103×10^−35

1 Stoney unit of length =___________________m.

A. 1.381×10^−28
B. 1.381×10^−32
C. 1.381×10^−35
D. 1.381×10^−38