【单选题】于1982年12月4日由全国人大公告发布施行()。
【单选题】在快走丝线切割加工中,电极丝张紧力的大小不应根据( )的情况来确定。
【多选题】冷战结束后国际战略形式的特点包括________。
【单选题】In testing for differences between the means of two related populations, the null hypothesis states that:
A.
the difference between the two population means is equal to 0.
B.
the population mean difference is equal to 0.
C.
the difference between the two population means is greater than 0.
D.
the population mean difference is greater than 0.
【多选题】在快走丝线切割加工中,电极丝张紧力的大小应根据()的情况来确定。
【单选题】In testing for differences between the means of two independent populations, the null hypothesis states that: ( )
A.
the difference between the two population means is equal to 2.
B.
the difference between the two population means is equal to 0.
C.
C.the difference between the two population means is greater than 0.
D.
D.the difference between the two population means is less than 2.