扩张型的产权变更的类型主要有（）。
A.兼并
B.收购
C.联营
D.要约收购
参考答案：A, B, C, D
I___ Beijing in a few days. Do you know when the earliest plane ____ ?
A．leaves; takes off
B．am leaving; takes off
C．leave; is taking off
D．am leaving; is taking off
按被测参数的不同，常见的冶金仪表怎样分类？
