电子银行收费采取以下哪几种方式？（）
A、延期支付
B、系统自动扣收
C、手工外收
D、上门收取
参考答案：B, C
用所给单词的适当形式填空。
1.—How is the ____ (weather ) in Chongqing?
—It ____ (rain) now.
2. Do you like ____ (wind) days?
3. Today is ____ (sun). Let's go shopping.
4. ___ it ____ (snow) in Moscow now?
5. My friend always ____ (study) hard at school.
若p为非负实数，随机变量ξ的概率分布如表所示：
则E(x)的最大值为（），D(x)最大值为（）．
