苯丙醇胺的研究中，年龄因素的选择往往会掩盖或歪曲苯丙醇胺引起_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

苯丙醇胺的研究中，年龄因素的选择往往会掩盖或歪曲苯丙醇胺引起出血性脑病中的真正风险，这种现象被认为

A．机会
B．偏倚
C．混杂
D．真正因果联系
E．随机变异

答案

参考答案：C

补全对话，情景问答

从对话后面所给7个句子中选出5个补全对话。

A: will you please give her this note?
B: What's your telephone number, please?
C: Is Bety at home?
D: Thank you very much!
E: And your name?
F: Would I pass on this note to you?
G: You are welcome.

Lucy=L Mrs. Black=M
L: Hello! 1.
M: I'm sorry she is out at the moment.
L: When she comes back, 2.            . please ask her to ring me as soon as possible.
M: Sure! 3.
L: 28521135
M: 4.
L: Lucy.
M: I'll leave the note on her desk and tell her to ring you up.
L: 5.            . Goodbye.

填空题

SPDIF 是SONY、PHILIPS 数字音频接口的简称，使用SPDIF OUT可实现高质量的纯数字音频回放，此时声卡上SPDIF OUT送出的声音信号的形式是______ 。