尺寸线和尺寸界线应()。
A.平行
B.垂直
C.倾斜45°
D.倾斜60°
参考答案:B
France's renewal of nuclear testing in the South Pacific last month triggered political debates nd mass demonstrations.
A.assumption
B.consumption
C.presumption
D.resumption
有效沟通的三条原则是聆听、表达和交流。