活塞环与气缸套磨合不良就投入使用,必然会产生严重的______。
A. 黏着磨损
B. 微动磨损
C. 腐蚀磨损
D. 磨粒磨损
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The first paragraph tells us that there’s good news for both online merchants and consumers.
A. 对
B. 错
E-commerce will shrink because online rip-offs of shoppers are on the rise.
A. 对
B. 错
The economic turmoil has occurred in the United States.
A. 对
B. 错
The economic turmoil has very bad effect on E-commerce.
A. 对
B. 错