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【单选题】
常用金属材料中铸造性能优良的是( )A.
低碳钢
B.
灰铸铁
C.
中、低碳钢
D.
高碳钢
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举一反三
【单选题】一辆发动机刚大修过不久的普通桑塔纳轿车出现排气管冒蓝烟现象,客户很不满意,要求修理厂返工,并作出适当的经济补偿。但修理厂认为该厂对发动机进行大修时完全按照国家标准规定的工艺执行的,发动机排气管冒蓝烟的主要原因是使用者未按走合规定执行或发动机出现过高温所致。双方争执不下。请您回答下面问题,并指出责任方。对缸壁进行激光处理的目的是:
A.
对缸壁进行表层淬火处理,提高硬度和耐磨性
B.
做激光标记,以便识别所用配件
C.
提高耐磨性的同时,也提高了润滑效果
D.
消除镗缸后遗留的缺陷
【简答题】Rewrite the following sentences using the comparative adjectives in brackets. Make any changes if necessary. 1 There are more and more cars on the roads so the impact of pollution is increasing. (more...
【单选题】The governmental departments concerned are aware that there are downfalls ______ more cars on the roads.
A.
to have
B.
having
C.
to having
D.
on having
【简答题】In America: There are many more cars than in China. Maybe the number of cars in California is the same as the number in China. But there are fewer traffic jams and accidents in America than in China. ...
【简答题】土的静止土压力系数值可在室内用()测得。
【单选题】下列关于ALTER TABLE 语句叙述错误的是()
A.
ALTER TABLE 语句可以添加字段
B.
ALTER TABLE 语句可以删除字段
C.
ALTER TABLE 语句可以修改字段名称
D.
ALTER TABLE 语句可以修改字段数据类型
【单选题】There serious air pollution if people use more and more cars.
A.
has
B.
will be
C.
will have
D.
are going to be
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