To check whether a char variable ch is an uppercase letter, you write ___________.
A. (ch >= 'A' || ch <= 'Z')
B. (ch >= 'A' && ch >= 'Z')
C. ('A' <= ch <= 'Z')
D. (ch >= 'A' && ch <= 'Z')
Which of the following is not a correct method in the Character class?
A. isLetterOrDigit(char)
B. isLetter(char)
C. toUpperCase()
D. toLowerCase(char)
梁变形后的轴线所在平面与荷载的作用平面重合的弯曲变形称为 弯曲。
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