【单选题】
A <{p}><{font _mstmutation="1" _msthash="20498" _msttexthash="7838402"}>薄壁件<{/font}><{br/}><{/p}>
B <{p}><{br/}><{font _mstmutation="1" _msthash="20499" _msttexthash="6675604"}>厚壁件<{/font}><{br/}><{/p}>
C <{p _msthash="197786" _msttexthash="9795838"}>铸铁件<{/p}><{p}><{br/}><{/p}>
D <{p}><{font _mstmutation="1" _msthash="20500" _msttexthash="5564806"}>钢件<{/font}><{br/}><{/p}>
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