粘接固定桥的固位主要依靠（） A．摩擦力 B．酸蚀，粘结技_爱下问搜题

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问题单项选择题

粘接固定桥的固位主要依靠（）

A．摩擦力

B．酸蚀，粘结技术

C．卡环

D．吸附力

E．粘结和卡环

答案

参考答案：B

完形填空

Sports are full of wonderful moments, but perhaps 36 is as exciting as the finish of the marathon. It is the longest, hardest 37 of all. The name “marathon” comes from a village in 38 . A famous battle was 39 there in the year 490 BC. When the Greeks had beaten the Persians, a soldier 40 all the way 41 Marathon to Athens, more than 40 kilometers to 42 people the good 43 . When the modern Olympic Games 44 in 1896, the organizers knew this 45 . The marathon has been a race 46 that time.
In the ancient world the Olympic Games were held 47 four years of 1000 years. They were an important part of life. In the 48 Games we try to copy their 49 . The finest sportsmen in the world are collected in one place 50 at least the finest “amateurs（业余爱好者） ” are. An amateur is someone who does not earn 51 money from sport. It is often difficult to say who is an amateur and who is not. It is 52 that Olympic athletes do not earn large amounts of money like professional （职业的）sportsmen. But Olympic athletes are often students or teachers of a 53 . They have to 54 a lot of time training. Their governments pay for their training travel and pocket money, 55 they want them to win. Some people think this changes the Olympics. They feel that the Games are now a political marathon.

D．taken place

C．interesting

D．interesting

单项选择题

一般规定液压泵吸油口距离油面高度不大于（）。

A.0.2m

B.0.3m

C.0.4m

D.0.5m