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【单选题】
Christian marriage had to be performed in secret because ______.A.
Christian marriage is illegal
B.
the couple is not old enough to get married
C.
their parents didn't allow the marriage
D.
the Emperor of Rome didn't allow Christian marriages
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皮皮学刷刷变学霸
举一反三
【单选题】判断字符型变量k是否为大写字母的正确表达式是
A.
k >= ‘A’ && k <= ‘Z’< /div>
B.
k >= ‘A’ and k <= ‘Z’< /div>
【多选题】判断字符变量c中存放的是否是大写字母,表达式为:
A.
c>=65 || c<=90< /div>
B.
c>=A && c<=Z< /div>
【简答题】由于邻二甲苯与对二甲苯、间二甲苯的结构、性质相近,因此它们混合时会形成 (理想 )溶液,它们的 ΔH= ( 0 ), ΔV= ( 0 )。