下列哪一种疾病,腹痛的部位常发生转移()
A.急性心肌梗死
B.急性阑尾炎
C.急性胰腺炎
D.急性胆囊炎
E.急性肾盂肾炎
参考答案:B
Studies from which form(s) of the efficient market hypothesis (EMH) provide evidence that security prices adjust so quickly to a public announcement that it is not possible for investors to realize significant abnormal returns after a public announcement has been made()
A. semip-form of the EMH.
B. weak-form of the EMH
C. p-form of the EMH
请选用图所提供的仪器组装一套装置,制取一瓶氧气.
(1)写出仪器A、C的名称:______、______;
(2)双氧水(H2O2)、氯酸钾、高锰酸钾三种物质在一定条件下分解都可以产生氧气,二氧化锰能加速上述三种物质的分解.请你根据上面提供的仪器(仪器不得改造),选择一个制氧气的方法并用化学方程式表示它的原理:______;制取大量氧气最好选用上述哪些仪器(发生装置)______(填字母);
(3)如果用如图所示装置收集氧气,则氧气由______(填字母)孔进入.