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【判断题】
防晒剂可以分为物理性的紫外线屏蔽剂和化学性的紫外线吸收剂。A.
正确
B.
错误
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反馈参考答案：
举一反三
【单选题】自动变速器冷油器的作用是，使高温油液在水箱内与冷却水或在散热器内与空气进行热量交换，保持油温为（）℃。
A.
50～60
B.
80～90
C.
100～105
D.
30～40
【单选题】We mustn't buy things we _____ (a)needn't (b)need not (c)don't need (d)haven't need
A.
needn't
B.
need not
C.
don't need
D.
haven't need
【简答题】Manufacturers need to be more s to the needs of consumers.
【单选题】Modern manufacturers, who need reliable sources of materials and technologically advancedcomponents to operate profitably, face an increasingly difficult choice between owning theproducers of these it...
A.
improvement in the management of overhead expenses
B.
enhancement of profit margins on sales of components
C.
simplification of purchasing and marketing operations
D.
reliability of a source of necessary components
E.
elimination of unnecessary research efforts
【多选题】以下关于对自动变速箱描述正确的是
A.
ISM 必须配备 A80 完成档位操作
B.
722.9 变速器电脑位于阀板上，侵泡在油液中
C.
自动变速器的车辆不允许拖车
D.
7G-DCT 采用了两组副变速箱组成
E.
可以通过失速试验判断变速器的性能
【简答题】Manufacturers currently are working to establish industry standards for digital t______ and reception of the signals.
【单选题】Manufacturers can use robots on an assembly line, so they don’t need so many workers, which causes job losses.
A.
con
B.
pro
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