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【单选题】
数控加工工艺特别强调定位加工,所以,在加工采用( )的原则。A.
互为基准
B.
基准统一
C.
自为基准
D.
选项A、B和C均正确
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【多选题】关于钢丝绳的选用下列说法中正确的有( )。
A.
钢丝绳的规格较多，起重工程常用的为6×19+1、6×37+1两种
B.
在起重工程中，用作缆风绳的安全系数不小于5
C.
使用较长时间后的钢丝绳会出现磨损、锈蚀和断丝，使其破断拉力明显降低，应停止使用，立即更换
D.
钢丝绳一般由高碳钢丝捻绕而成
E.
吊索，俗称千斤绳、绳扣，用于连接起重机吊钩和被吊装设备
【判断题】In a price communication， it is always the buyer who makes an inquiry and theseller makes an offer
A.
正确
B.
错误
【单选题】Farmers in the developing world would hate price fluctuations. It makes it hard to plan ahead. But most of them have little choice, they sell at the price the market sets. Farmers in Europe, the US an...
A.
in the developing world
B.
in Japan
C.
in Europe
D.
in America
【单选题】Farmers in the developing world hate price fluctuations. It makes it hard to plan ahead. But most of them have little choice: they sell at the price the market sets. Farmers in Europe, the US and Japa...
A.
in the developing world
B.
in Japan
C.
in Europe
D.
in America
【简答题】Farmers in the developing world would hate price fluctuations. It makes them hard to plan ahead. But most of them have little 【M1】______ choice: they sell at the price the market sets. Farmers in Euro...
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