下列化合物按化学位移值的从大到小的顺序排列正确的是( ) A: CH3Br >CH3Cl> CH4> CH3I B: CH3F >CH3Cl> CH3I> CH4 C: CH4> CH3I > CH3Cl > CH3Br D: CH3I > CH4> CH3Cl > CH3F
下列化合物按化学位移值的从大到小的顺序排列正确的是( ) A: CH3Br >CH3Cl> CH4> CH3I B: CH3F >CH3Cl> CH3I> CH4 C: CH4> CH3I > CH3Cl > CH3Br D: CH3I > CH4> CH3Cl > CH3F
下列化合物按化学位移值的从大到小的顺序排列正确的是( ) A: CH3F >CH3Cl> CH4> CH3I B: CH3F >CH3Cl> CH3I> CH4 C: CH4> CH3I > CH3Cl > CH3F D: CH3I > CH4> CH3Cl > CH3F
下列化合物按化学位移值的从大到小的顺序排列正确的是( ) A: CH3F >CH3Cl> CH4> CH3I B: CH3F >CH3Cl> CH3I> CH4 C: CH4> CH3I > CH3Cl > CH3F D: CH3I > CH4> CH3Cl > CH3F
下列各组化合物分子中,键角大小顺序正确的是 A: BeCl<sub>2</sub>>BF<sub>3</sub>=NH<sub>3</sub>>CH<sub>4</sub> B: NH3>CH<sub>4</sub>>BeCl<sub>2</sub>>BF<sub>3</sub> C: CH<sub>4></sub>NH<sub>3</sub>=BF<sub>3</sub>>BeCl<sub>2</sub> D: BeCl<sub>2</sub>>BF<sub>3</sub>>CH<sub>4</sub>>NH<sub>3</sub>
下列各组化合物分子中,键角大小顺序正确的是 A: BeCl<sub>2</sub>>BF<sub>3</sub>=NH<sub>3</sub>>CH<sub>4</sub> B: NH3>CH<sub>4</sub>>BeCl<sub>2</sub>>BF<sub>3</sub> C: CH<sub>4></sub>NH<sub>3</sub>=BF<sub>3</sub>>BeCl<sub>2</sub> D: BeCl<sub>2</sub>>BF<sub>3</sub>>CH<sub>4</sub>>NH<sub>3</sub>
判断ch是数字字符的C语言表达式是( ) 。 A: '0' <= ch <= '9' B: ch >= '0' && ch <= '9' C: ch >= '1' && ch <= '10' D: ! (ch < '0' || ch > '9') E: ch >= '0' || ch <= '9'
判断ch是数字字符的C语言表达式是( ) 。 A: '0' <= ch <= '9' B: ch >= '0' && ch <= '9' C: ch >= '1' && ch <= '10' D: ! (ch < '0' || ch > '9') E: ch >= '0' || ch <= '9'
以下哪个选项是判断ch是否为大写字母的正确形式? A: ch >= 'A' || ch <= 'Z' B: ch >= 'A' AND ch <= 'Z' C: ch <= 'Z' && ch >= 'A' D: 'A' <= ch <= 'Z'
以下哪个选项是判断ch是否为大写字母的正确形式? A: ch >= 'A' || ch <= 'Z' B: ch >= 'A' AND ch <= 'Z' C: ch <= 'Z' && ch >= 'A' D: 'A' <= ch <= 'Z'
下面判断ch是大写或者小写英文字母的表达式哪个正确? A: ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z' B: ch >= A && ch <= Z || ch >= a && ch <= z C: 'A' <= ch <= 'Z' || 'a' <= ch <= 'z' D: A <= ch <= Z || a <= ch <= z
下面判断ch是大写或者小写英文字母的表达式哪个正确? A: ch >= 'A' && ch <= 'Z' || ch >= 'a' && ch <= 'z' B: ch >= A && ch <= Z || ch >= a && ch <= z C: 'A' <= ch <= 'Z' || 'a' <= ch <= 'z' D: A <= ch <= Z || a <= ch <= z
判断char型变量ch是否为大写字母的正确表达式是( ) A: 'A' <= ch <= 'Z' B: (ch >= 'A') & (ch <= 'Z') C: (ch >= 'A') && (ch <= 'Z') D: (ch >= 'A') || (ch <= 'Z')
判断char型变量ch是否为大写字母的正确表达式是( ) A: 'A' <= ch <= 'Z' B: (ch >= 'A') & (ch <= 'Z') C: (ch >= 'A') && (ch <= 'Z') D: (ch >= 'A') || (ch <= 'Z')
断char型变量ch是否为小写字母的正确表达式是()。 A: 'a' <= ch <= 'z' B: (ch >= a) && (ch <= z) C: (ch >= 'a') && (ch <= 'z') D: ('a' >= ch) || ('z' <= ch)
断char型变量ch是否为小写字母的正确表达式是()。 A: 'a' <= ch <= 'z' B: (ch >= a) && (ch <= z) C: (ch >= 'a') && (ch <= 'z') D: ('a' >= ch) || ('z' <= ch)
判断char型变量ch是否为小写字母的正确表达式是______。 A: a' B: (ch > ='a') & (ch C: (ch > ='a') && (ch D: ('a' =ch)
判断char型变量ch是否为小写字母的正确表达式是______。 A: a' B: (ch > ='a') & (ch C: (ch > ='a') && (ch D: ('a' =ch)
下列选项中用于判断ch是否是英文字母的表达式是( )。? ( ch >= 'a' && ch <= 'z' ) || ( ch >= 'A' && ch <= 'Z' )|;( 'a' <= ch <= 'z' ) || ( 'A' <= ch <= 'Z' )|( ch >= 'a' && ch <= 'z' ) && ( ch >= 'A' && ch <= 'Z' )|( 'a' <= ch <= 'z' ) && ( 'A' <= ch <= 'Z' )
下列选项中用于判断ch是否是英文字母的表达式是( )。? ( ch >= 'a' && ch <= 'z' ) || ( ch >= 'A' && ch <= 'Z' )|;( 'a' <= ch <= 'z' ) || ( 'A' <= ch <= 'Z' )|( ch >= 'a' && ch <= 'z' ) && ( ch >= 'A' && ch <= 'Z' )|( 'a' <= ch <= 'z' ) && ( 'A' <= ch <= 'Z' )