按要素比例标准,技术进步有可分为()
A、劳动节约型
B、环保型
C、中性型
D、资本节约型
参考答案:A, C, D
—What time will Mr. Brown be back to China?
—Sorry. I don’t know______.
A.when did he go abroad
B.why he is going abroad
C.how soon will he be back
D.how long he will stay abroad
()分为完全互换法和不完全互换法。