过点(1,1)且与直线x-2y-2=0平行的直线方程是 ( )
A.x-2y-1="0"
B.x-2y+1="0"
C.2x+y-2="0"
D.x+2y-1=0
答案:B
Our school ________ two maths teachers and a cleaner.[ ]
A. need
B. needs
C. to need
D. needing
轧制Ф12的线材时精轧机()架出成品。
A.16
B.18
C.20
D.22