（）是在启用前就以编有顺序号的若干账页固定装订成册的账簿。A．总账 B．明细账 C．

《煤矿安全规程》对采掘工作面的瓦斯检查次数有什么规定？

依据《通用安装工程工程量计算规范》（GB50856—2013）的规定，通信线路安装工程中，光缆接续的计量单位为（）。

A.段

B.头

C.芯

D.套

(B)

Directions: Translate the following passage into Chinese.
Monitor your body language to make sure you don’t seem too desperate for the job, or too eager to please. Keep a poker face in business situations. Inappropriate smiling is the most common example of a nonverbal behavior that undercuts verbal messages—making you appear weak and unassertive. Good eye contact is also important. One study found that job applicants who make more eye contact are perceived as more alert, dependable, confident and responsible.

教育学的研究对象是( )

A．教育问题

B．教育现象

C．教育事实

D．教育规律

弯曲时，相对弯曲半径r/t越小回弹越小；弯曲角越大，回弹越大。（）