Theory X holds that:

A．Quality improvements lie in the hands of quality circle

B．Profits are tied to meeting schedule deadline

C．Absenteeism is tied to poor working condition

D．Workers are inherently unmotivated and need p guidanc

接触化学毒物人员的膳食营养原则( )。

A．补充B族维生素

B．供给充足的维生素C

C．补充富含含硫氨基酸的优质蛋白质

D．保证硒铁钙等矿物元素的膳食供应