题目内容

船舶甲板上的起货机生锈是()。

A. 浓差腐蚀
B. 缝隙腐蚀
C. 微观电化学腐蚀
D. 电偶腐蚀

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HXD3型机车二系采用髙圆螺旋()。

A. 弹簧
B. 减震器
C. 弹簧与减震器

A refrigerant with oil in solution has a ().

A. higher boiling temperature for a given pressure than does a pure refrigerant
B. lower boiling temperature for a given pressure than does a pure refrigerant
C. boiling pressure equal to that of a pure refrigerant at a given pressure
D. boiling point will not be affected by entrained oil

下列哪种花卉是蔓性的草本花卉?()

A. 常春藤
B. 紫藤
C. 花叶蔓长春花
D. 茑萝

简述应该通过什么样的方法来保持客户?

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