皮皮学，免费搜题
登录
搜题
【单选题】
W: Excuse me. I just received my telephone bill, and there's a problem with it M: May I see your bill, please? W: Certainly. There it is. On July lst, I really don t know anybody in Finland M: OK, don' t worry. I'll take the call off. Let's see... It was 42. Your bill was $66.10, minus $42, so your new total is $ 24.10. I'm very sorry about the mistake W: That's OK. It wasn’t your fault Where are the two speakersA.
In a mobile business hall
B.
In a store
C.
In an office
D.
In the post office
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】化妆的目的 。
【单选题】硫酸镁抗惊厥的作用机制是()。
A.
特异性地竞争Ca2+受点，拮抗Ca2+的作用
B.
阻碍高频异常放电的神经元的Na+通道
C.
作用同苯二氮革类
D.
抑制中枢多突触反应，减弱易化，增强抑制
E.
以上都不是