问题
选择题
下列实例中，属于增大磨擦的是[ ]
A、在拉杆式旅行箱上安装轮子
B、在机器的轴上安装流动轴承
C、在结冰的路面上撒上煤渣
D、在气垫船底和水面之间充一层空气垫
答案
C
搜题请搜索小程序“爱下问搜题”
下列实例中，属于增大磨擦的是[ ]
A、在拉杆式旅行箱上安装轮子
B、在机器的轴上安装流动轴承
C、在结冰的路面上撒上煤渣
D、在气垫船底和水面之间充一层空气垫
C
假设你是Steve, 收到Diana的电子邮件，要你替她租房子。现在请根据邮件内容在租房公司填写有关表格。 Dear Steve, I’m going to study in Chicago University in September, so I have to find a room to live in. I need to share(分享, 共用) the things with others in the house, because housing is so expensive in Chicago. Please find a room at lower price (about 200 dollars a month), because it is not easy for me, a first year student, to find a good part-time job soon. Please email to me if you have anything. My e-mil address is Diana@yahooo.com. I hope to see you soon. Love, Diana
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