【简答题】
若X~B(5,14),则DX的值为______.
参考答案:
参考解析:
举一反三
【简答题】从方框内选择词的适当形式填空。northern, stop, ride, quickly, forget, Canada, fish, sightsee, plan, babysit 1.—What are you doing for vacation? —I'm ______ my sister. 2. In ______ America, most students go to school ...