Which statement is true about assertion in the Java programming language?()
Assertion expressions should not contain side effects.
B. Assertion expression values can be any primitive type.
C. Assertion should be used for enforcing preconditions on public methods.
D. An AssertionError thrown as a result of a failed assertion should always be handled by the enclosing method.
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试误式解决问题是动物解决问题的特征;顿悟式解决问题是人类解决问题的特征。
A. 正确
B. 错误
《红楼梦》中,晴雯为什么要带病补孔雀裘?这一情节表现了她怎样的个性特征?
压力式局部通风机和启动装置,必须安装在进风巷道中,距风口不得小于()米。
A. 3
B. 5
C. 10
D. 15