在钢环上划线时,应以()为划线基准。
A、设计基准;
B、已加工表面;
C、一条中心线;
D、外圆。
参考答案:B
In the police station, I saw the man from ______room the thief had stolen the TV set.
A.whose
B.whom
C.which
D.that
()是复位指令的语句表符号。
A.A
B.R
C.S
D.O