∵|-16|=16,|-27|=27,且27>16;
∴-27<-16.
The teacher with his students _____ playing _____football at this tine yesterday.
A.was; the
B.is;the
C.were ;/
D.was; /
大接地电流系统与小接地电流系统的划分标准,是系统的零序电抗与正序电抗的比值X0/X1。我国规定:凡是()的系统属于大接地电流系统。
A、X0/X1≤4~5
B、X0/X1>4~5