皮皮学，免费搜题
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【判断题】
带传动使用张紧轮后,可使传动能力加强。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
【简答题】A．4.2 billion years ago. B．3.3 billion years ago. C．2.9 billion years ago. D．1.2 billion years ago.
【简答题】A．5,000 years ago. B．4,000 years ago. C．50,000 years ago. D．40,000 years ago.
【单选题】某商品的销售单价为1500元/台，单位商品的变动成本为1300元/台，固定成本分摊为6万元。该商品计划期目标盈利额为4万元，则该商品的保利销售量为（ ）台。
A.
200
B.
300
C.
500
D.
600
【简答题】A．150 years ago. B．60 million years ago. C．16 million years ago. D．150 million years ago.
【单选题】A. About 100 years ago. B. About 115 years ago. C. About 120 years ago. D. About 150 years ago.
A.
About 100 years ago.
B.
About 115 years ago.
C.
About 120 years ago.
D.
About 150 years ago.
【单选题】When was the building built?
A.
Several years ago.
B.
Twelve years ago.
C.
Twenty years ago.
【单选题】When did Jim begin to collect stamps?
A.
Two years ago.
B.
Three years ago.
C.
Four years ago.
【单选题】Lindman wrote his book __.
A.
ten years ago
B.
twenty years ago
C.
more than twenty years ago
D.
thousands of years ago
【简答题】A. About 100 years ago. B. About 115 years ago. C. About 120 years ago. D. About 150 years ago.
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