—How come you were half an hour late for work this morning, Mike?
—_______My car broke down halfway.
A:Yes, so what?
B:No, it's not my fault
C:Well, who knows?
D:Sorry, but I couldn't help it.
①行政权 ②立法权 ③司法权 ④外交权
缩写句子
教室里骤然响起一阵掌声。
(Ⅰ)求m的值;
(Ⅱ)从频率分布直方图估算这批电子元件寿命的平均数、中位数的估计分别是多少?
(Ⅲ)现要从300~400及400~500这两组中按照分层抽样的方法抽取一个样本容量为36的样本,则在300~400及400~500这两组分别抽多少件产品.