某公司生产产品每年需要甲零件300件,如果自制,该零件增加公司的固定成本300元,该零件自制的单位变动成本为7元;如果外购,零件的单价为8元,则该公司应该()。
A自制
B 外购
C两者效果一样
D不能确定

A. 枕套的基本品质要求是涤棉，浅黄色为主，布面光洁，无明显疵点
B. 枕套的基本品质要求是化纤，浅色为主，布面光洁，无明显疵点
C. 枕套的基本品质要求是全棉，白色为主，布面光洁，无明显疵点
D. 枕套的基本品质要求是混纺，与床单配套，布面光洁，无明显疵点

A. reveal that taste is linked to sound
B. explore toffee" taste in background music
C. show how sound alters the way food tastes
D. find out if sound has different tastes

A. the economy went into the rains
B. the economy started to rebound
C. monthly unemployment was at a low level
D. monthly unemployment went out of the bottom