A．methodsB．formsC．rulesD．activities
A. methods
B. forms
C. rules
D. activities
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感应电炉的热效率能达到()。
A. 60%
B. 75%
C. 80%
D. 85%
根据我国《合同法》，以下对买卖合同中标的物的风险负担的表述正确的是（）。
The principal discovery in this century shows
A. man has overthrown Newton's laws of physics.
B. man has solved a new set of gigantic puzzles.
C. man has lost many scientific discoveries.
D. man has given up some of the once accepted theories.
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