PD.C.A.循环是质量保证体系运转的基本方式。PD.C.A.循环的第二个阶段是( )
A．检查阶段B．计划阶段C．执行阶段D．处理阶段
参考答案：C
Finally, he found his calculator __________ he lost it.
A．the place in which
B．in which
C．the place where
D．where
放线菌中产抗生素最多的属为（）。
