学校文化是产生和传播先进文化的基础。

典型心绞痛通常持续时间是（）

A.心尖部一过性刺痛

B.胸骨后压榨性痛持续15min

C.3～5min，经休息或含服硝酸甘油后可缓解

D.情绪激动后心前区不适，卧床2天后逐渐减轻

E.上腹部疼痛，含化硝酸甘油1min消失

下列哪些法律属于澳大利亚的反洗钱法律（）

A.《1987年犯罪收益法》

B.《1987年刑事事务相互协助法》

C.《1988年金融交易报告法》

D.《1994年禁止洗钱法》

在进行汽车总体布置是，使用五条基准线，是怎样确定的？

正常生产中，不是造成减压水封破坏的主要原因有（）。

A.水封罐倒U形管顶破虹吸未开或堵塞

B.水封罐排水控制阀失灵

C.塔顶温度太高

D.水封罐放大气管线堵塞或存油冻凝

Because dinosaurs were reptiles, scientists once assumed that, like all reptiles alive today, dinosaurs were coldblooded. The recent discovery of dinosaur fossils in the northern arctic, however, has led a number of researchers to conclude that at least some "dinosaurs might have been warmblooded. These researchers point out that only warm-blooded animals could have withstood the frigid temperature that are characteristic of arctic winters, whereas cold-blooded animal would have frozen to death in the extreme cold.
Which one of the following, if true, weakens the researchers’ argument

A．Today’s reptiles are generally confined to regions of temperate or even tropical climates.

B．The fossils show the arctic dinosaurs to have been substantially smaller than other known species of dinosaurs.

C．The arctic dinosaur fossils were found alongside fossils of plants known for their ability to withstand extremely cold temperatures.

D．The number of fossils found together indicates herds of dinosaurs so large that they would need to migrate to find a continual food supply.

E．(E) Experts on prehistoric climate conditions believe that winter temperatures in the prehistoric northern arctic were not significantly different from what they are today.