In comparing engines of equal horsepower, higher exhaust gas temperatures occur in a/an（）
A. opposed-piston engine
B. double-acting engine
C. two-stroke/cycle engine
D. four-stroke/cycle engine
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Whcih of the following best states the behaviorist view of child language acquisition （）.
A. Language acquisition is a process of habit formatio
B. Language acquisition is the species-specific property of human beings
Children are born with an innate ability to acquire language
D. Humans are equipped with the neural prerequisites for language and language use
学科教学目标体系按层次划分，可以分为（）
A. 学科教学目标
B. 单元教学目标
C. 章节教学目标
D. 课堂教学目标
E. 每个知识点的教学目标
（），有利于减少搬运人员和搬运工具，缩短搬运时间。
在数据加密技术中，我们将待加密的报文称为（）。
A. 正文
B. 短文
C. 密文
D. 明文
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