Her politics _____ neither conservative nor liberal. [ ]
a. is
b. are
c. was
d. has been
b
目前 , 数控车床使用最普遍的是立方氮化棚刀具和高速钢刀具。
如图所示的A、B两种剪刀,
在理发时应选______种剪刀;剪铁片时应选用______种剪刀.