问题
单项选择题
修船时,抽出艉轴后立即用湿草包填塞于艉轴承内,这是为了()。
A.保护艉轴承精度
B.防止异物损伤轴承
C.防止铁梨木产生裂纹
D.防止艉轴承变形
答案
参考答案:C
修船时,抽出艉轴后立即用湿草包填塞于艉轴承内,这是为了()。
A.保护艉轴承精度
B.防止异物损伤轴承
C.防止铁梨木产生裂纹
D.防止艉轴承变形
参考答案:C
短文填空 选择恰当的单词填空,每词限用一次。(有两个多余的选项)
Before you are allowed to have a full license, you have to take a driving test. You can take a test in your ____ car, but it has to be fit for the road. In the test you have to drive round for about half an hour and then ____ a few questions. If you don’t pass the test, you are allowed to take it again a few weeks ____ if you want to. In 1970 a woman passed her ____ test after 212 driving lessons. When you’ve passed your test, you don’t have to take it again, and you are allowed to go on driving as long as you like. Britain’s ____ driver was a man who drove in 1974 at the age of 100. Before 1904 everyone was allowed to drive, even children. Then from 1904 car drivers had to have a license. But they didn’t have to take a test ____1935. On the early days of car driving, before 1878, cars weren’t allowed to go faster than four miles an hour, and someone had to lead the car with a red flag. |