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问题
单项选择题
TD-SCDMA网络能支持用户最大移动速度是()。
A.100km/h
B.120km/h
C.240km/h
D.280km/h
答案
参考答案:B
选择题
根据图片,选择正确的句子。
( ) 1.
A. She washes the dishes every day.
B. She feeds the fish every day.
( ) 2.
A. John can cook rice at home.
B. John can make a sandwich.
( ) 3.
A. Did he make the bed yesterday? No, he didn't.
B. Did he make the bed yesterday? Yes, he did.
( ) 4.
A. Sally often goes to school by bus.
B. Sally often goes to school on foot.
( ) 5.
A. What will he do tomorrow?
He will go swimming.
B. What will he do tomorrow?
He will visit a friend.
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解答题
从2009年夏季开始,我省普通高中全面实施新课程,新课程的一个最大亮点就是实行课程选修制.现在某校开设通用技术、信息技术和劳动技术三门选修课,假设有4位同学,每位同学选每门选修课的概率均为
1
3
,用ξ表示这4位同学选修通用技术课的人数,求:
(I)至少有2位同学选修通用技术课的概率;
(II)随机变量ξ的期望.
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