用细线悬挂的两个通草球相互排斥，则（ ） A．它们一定带异种电荷 B．它们一定带

A p corporate code of ethics is vitally important. Which of the following statements concerning a firm’s code of ethics is least likely accurate（）

A. As part of investor review of the firm’s ethical climate, investors should determine whether the firm gives the board access to relevant corporate information in a timely manner.

B. A firm’s code of ethics sets standards for ethical conduct based on basic principles of integrity, trust and honesty.

C. A firm’s code of ethics should require clear disclosure of any advantages given to the firm’s insiders that are not also offered to shareholders.

马克思主义哲学以前唯物主义的主要缺陷是（）。

A.用机械力学的尺度衡量物质的一切运动

B.具有形而上学性

C.不承认存在决定意识

D.不承认社会存在决定社会意识

教师在布置课堂练习和家庭作业时，错误的做法是（）。

A.课堂练习的布置与教学目标一致

B.练习题的设计富于变化，并有适当的难度

C.教师给学生以适当的帮助

D.只给学生一些知识记忆性的练习

水痘病例应隔离至（）

A.疱疹结痂后，不少于病后2周

B.发热消退后1周

C.疱疹消退1周

D.全部水痘疱疹结痂、痂皮干燥