某企业生产A产品,每增加1000元成本所增加的相应产量为20件,则A产品的边际成本为( )。
A.0元/件 B.50元/件C.10元/件 D.100元/件
参考答案:B
----If this had happened to you, what would you have done?
----Me? I ________ the alarm.
A.would turn on
B.would have turned on
C.had turned on
D.must have turned on
当液控失效时,闸板防喷器可利用手动锁紧装置关闭。