In the keyboard example, the 'costs' the writer is referring to are concerned with
A.A the price of the product
B.B the quality of the product
C.C the need for user trainin
D.D the lack of useful informatio
第4题
为了提高嫩枝扦插成活率,扦穗上应保留()。
A.全部叶片
B.部分叶片
C.不留叶片
D.越多越好
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