皮皮学，免费搜题
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搜题
【单选题】
某银行想知道平均每户活期存款余额和估计其总量,根据存折账号的顺序,每50本存折抽出一本登记其余额。这样的抽样组织形式是( )A.
整群抽样
B.
纯随机抽样
C.
类型抽样
D.
等距抽样
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】What is the problem of Englands emergency health care services?
A.
The ambulances can't take the patients to the hospitals in time.
B.
The health care workers on the ambulances are not well-trained.
C.
The hospitals have difficulty treating patients timely.
D.
The hospitals can't collect the enough medical care expenses.