皮皮学，免费搜题
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【单选题】
如果受要约人在承诺中对要约的内容作了添加和变更，根据《国际商事合同通则》的规定，该项承诺( )。A.
原则上视为有效的承诺
B.
肯定是无效的承诺
C.
原则上视为一项反要约
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements is TRUE?
A.
They had to stand under the pressure three times the force of gravity.
B.
Ten days later in the test, they had to spend other twenty days in bed.
C.
During the whole test, they suffered backaches and other discomforts.
D.
Some of the women suffered great loss of calcium.
【简答题】采用3个以上亲本进行两次以上的杂交方式叫( )。