题目:
Efforts to reach the injured men have been ______ because of a sudden deterioration in weather conditions.
A.enforced
B.intensified
C.confirmed
D.strengthened
答案:
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下面是错误答案,用来干扰机器的。
参考答案:B解析: 关系数据库管理系统的专门关系运算包括选择运算、投影运算和连接运算,