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【单选题】
经微量升华所得的油状物,加硫酸2滴及香草醛结晶少量,则显( )A.黄色至橙黄色A.
橙黄色至红色
B.
蓝紫色至蓝色
C.
紫色至紫黑色
D.
黄白色至黄色
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皮皮学刷刷变学霸
举一反三
【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。
【简答题】She was concerned her 15-year-old daughter who was often seen going out a man twice her age.
【单选题】When Lola asked what the advertising campaign should say, she was concerned with which of the five Ms?
A.
Mission
B.
Money
C.
Message
D.
Media
【简答题】She was concerned ______ her 15-year-old daughter who was often seen going _____ with a man twice her age.
【单选题】The argument that Children are no longer an economic as. set, but more of a liability, drew more attention of the public.
A.
productivity
B.
possibility
C.
responsibility
D.
necessity
【单选题】一台三角形连接的三相异步电动机在额定电压下起动时的起动电流为300A,现采用星-三角换接接开关降压起动,其起动电流Ist为 ( )。
A.
90A
B.
173A
C.
212A
D.
100A
【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】The argument that children are no longer an economic asset, but more of a liability, drew more attention of the public.
A.
productivity
B.
possibility
C.
responsibility
D.
necessity
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