【简答题】按照产品在运输、销售过程中的经济性划分,包装技术包括() A单个包装技术 B内包装技术。 C销售包装技术。 D外包装技术。
【判断题】蔬菜水果主要提供人体所必需的维生素、膳食纤维和无机盐。
【单选题】Fully ____________ looking after three children at home, she no longer has time to enjoy the various activities in the club.
【简答题】She was concerned ______ her 15-year-old daughter who was often seen going _____ with a man twice her age.
【简答题】蔬菜水果主要提供人体所必需的维生素,膳食纤维和()。
【单选题】蜗轮蜗杆机构的传动比hz=ni/n2=z2/z1,其中z1是指( )