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【多选题】
以实物表示商品品质的方法有A.
看货成交
B.
凭样品买卖
C.
凭规格买卖
D.
凭等级买卖
E.
凭标准买卖
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】To analyze a value motion, what should be done first?
A.
To set the context.
B.
To define the motion .
C.
To provide evidence.
D.
To set standards.
【简答题】What type of motion can be transmitted by hydraulic actuators?A. linear motion B. rotary motion C. both A. and B. D. none of the above
【单选题】听力原文：What is the acceleration? (15)
A.
A kind of motion.
B.
A steady speed.
C.
The motion of a plane.
D.
An increase in speed.
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