【单选题】——What’s your mother? ——She_________ a teacher, but now she is a doctor.
【单选题】-Peter, what’s your mother doing now? -She ____________in the kitchen.
【单选题】---What’s your mother like? ---- .
D.
She looks after my father
【多选题】安装在车床主轴上的夹具,根据被加工工件定位基准和夹具的结构特点,可分为()等类型。
A.
以工件外圆为定位基面的卡盘和夹头式车床夹具,如自定心卡盘及各种定心夹紧卡头等
B.
以工件内孔为定位基面的心轴式车床夹具,如各种定位心轴(刚性心轴)和弹簧心轴等
D.
以工件的不同组合表面定位的 角铁和花盘式夹具
【单选题】—Peter, what’s your mother doing now? —She____________in the kitchen.
【判断题】运算器的主要功能是进行算术运算,不能进行逻辑运算。
【单选题】- What’s your mother doing now? - She the room.
【单选题】—What’s your mother__________ now? —She’s __________ our house.