生态系统的稳定性是指() A.随自身的结构和功能保持稳定不变的能力 B.对外界干

题型:单项选择题

问题:

生态系统的稳定性是指()

A.随自身的结构和功能保持稳定不变的能力

B.对外界干扰具有一定的抵抗能力

C.保持或恢复自身结构和功能相对稳定的能力

D.遭到外界干扰因素的破坏后恢复到原状的能力

考点:高中生物生态系统的结构和功能生态系统的结构和功能题库
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大柴胡汤中配伍大黄的主要作用是()

A.活血化瘀

B.内泻热结

C.疏肝敛阴

D.缓急止痛

E.清热去火

题型:单项选择题

杜冷丁是一种能使人形成瘾癖的麻醉药品,被滥用时也会成为毒品.______(判断对错)

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骏马因为有了缰绳失去了奔驰,风筝因为脱了线就飞走了,陀螺因为一条线抽他就不停的转,谈谈你对这三句话的理解,结合自身有什么启示?

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Aristotle was one of those who could found a civilization, and while he thought of education as both a social value and an end in itself, he ascribed its chief importance (21) what might be considered a third basic concept of education: to train the mind to think, (22) what it is thinking about. The key is not (23) it knows but how it (24) any new fact or argument. "An educated man," Aristotle wrote in On the Parts of Animals, "should be able to (25) a fair offhand judgment as to the goodness or badness of the method used by a professor in his exposition. To be (26) is in fact to be able to do this."
The Aristotle view of education as a (27) has become the conventionally worthy answer today (28) college presidents and other academic leaders are asked what an education should be. An educated man, says Harvard President Bok, (29) a deep breath, must have a "curiosity in (30) the unfamiliar and unexpected, an open-mindedness in entertaining opposing points of view, (31) for the ambiguity that surrounds so many important issues, and a willingness to make the best decision he can in the fact of uncertainty and doubt."
This is an approach that appears to (32) more importance to the process of learning (33) to the substance of what is learned. The very old notion of the generalist who could comprehend all subjects has (34) been an impossibility. To make matters (35) more difficult, the fields of knowledge keep changing.

A. attach B. impose C. reflect D. pay

题型:单项选择题

船岸进行ARQ通信时,工作频率应选用()格式.

A、非成对频率

B、指定的成对频率

C、自定任选频率

D、A.B.C均是

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