At present, the core of China’s export market strategy is to achieve a()export market structure
A. diversified
B. centralized
C. subdivided
D. natural
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The Belt and Road Initiative is a (n)()
A. agenda
B. project
C. initiative
D. strategy
带头结点的单链表first为空的判定条件是()
A. first == NULL;
B. first->link == NULL;
C. first->link == first;
D. first != NULL;
继电器按继电保护的作用,可分为测量继电器和辅助继电器两大类,而()就是测量继电器中的一种
A. 时间继电器
B. 电流继电器
C. 信号继电器
D. 功率继电器