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更多“在△ABC中，sin A：sin B：sin C=2：3：4…”相关的问题
第2题
在？ABC中 ，已知a=1,b=2, cosC=-1/4（1）求 ？ABC 的周长；（2）求 sin（A+ C ) 的值．
在？ABC中 ，已知a=1,b=2, cosC=-1/4
（1）求 ？ABC 的周长；
（2）求 sin(A+ C ) 的值．
第4题
计算第一型面积分：（S)为圆锥面的一部分：x=rcosψsinα，y=rsinψsinα，z=rcosα（0≤r≤α，0≤ψ≤2π)，α为常数
计算第一型面积分：
(S)为圆锥面的一部分：x=rcosψsinα，y=rsinψsinα，z=rcosα(0≤r≤α，0≤ψ≤2π)，α为常数
第5题
One theme of Hawthorne's writings is that sin affects people differently,but recognition of our sin makes us stronger and more sympathetic to others.（）
第8题
Which of the following statements about The Scarlet Letter is NOT true? （）
A.It explores man's never-ending search for the satisfaction of matirilitic desires.
B.It relates the conflits between the society and the individual.
C.Itis about the efct of sin on the people involved and the society as a whole.
D.It presents a psychological analysis of the inward tensions of the characters.
第10题
Among the following statements,（）is nota theme of Hawthorne's writings.
A.the consequences of pride,selfishness,and secret guilt;
B.the conflict between lighthearted and somber attitudes toward life;
C.the impact of the past (esp.the Puritan past) upon the present;
D.Guilt that can eradicate sin from the human heart.
