在CA614卧式车床上车削普通螺纹和米制蜗杆时，交换齿轮传动比是63:75
参考答案：错
"They're the best team I've seen thus far," says ______ men's basketball coach Larry Brown.
A．American's
B．US
C．the USA
D．United State of America
试述袋装水泥取样方法？
