柴油机转速实验时,柴油机转速从1000r/min降到430r/min的时间应为()。
A.20~22s
B.18~20s
C.15~18s
参考答案:C
在市场定位过程中,不论是采取两维定位或是多维定位,关键是要选好______。
A.质量
B.变量
C.商机
D.需求状态
The operation of _____ the connected (连体的) twins got close to _____. [ ]
A. dividing; being finished
B. separating; being finished
C. separating; finishing
D. dividing; finishing