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【判断题】
一定条件下,单位变动成本总是固定不变的。A.
正确
B.
错误
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】由于现场施焊条件较差，焊缝质量难以保证，所以较重要或受动力荷载的大型平台梁，其工地拼接宜优先采用（ ）。
A.
安装螺栓加焊缝
B.
永久螺栓加焊缝
C.
高强螺栓
D.
焊缝连接
【单选题】由于现场施焊条件较差，焊缝质量难以保证，所以较重要或受动力荷载的大型梁，其工地拼接宜采用（ ）
A.
安装螺栓加焊缝
B.
永久螺栓加焊缝
C.
高强螺栓
D.
焊缝连接
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【单选题】What is the man’s wife doing?
A.
Looking after their son at home.
B.
Leaving town on business.
C.
Helping their son with his study.
【简答题】根据听到的材料，回答 2～5 题 第 2 题 What is the man’s problem? [A] He is always laughing at other students. [B] He was constantly talking with other students in class. [C] He disturbed the teacher by asking questi...
【简答题】听下面一段材料，回答第1-3题。 1. What is the man’s problem? A. He failed his English test B. He’s worried about his result. C. He’s afraid of tomorrow’s test. 2. What does the woman do when she’s in bad mood? A. H...
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