单项选择题

常用铸造合金中，铸造性能最差的是（）。

A．灰铸铁
B．球墨铸铁
C．可锻铸铁
D．铸钢

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关系型数据库与HDFS之间相互数据迁移的工具是（）。

A．distcp
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C．fastcopy
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单项选择题

He noted that German investors were ________ invest in stocks, but were crazy about bitcoin.
A、willing to
B、willing for
C、reluctant to
D、reluctant for