肺部感染病员入院铺（）。A.备用床 B.暂空床 C.麻醉床 D.抢救床 E.木板床

—Shall we go out to the seaside this weekend?

—________ Ring me up at any time.

A．Hold on，please.　

B．What for?

C．That depends.　

D．Sounds good.

用20mL18.4mol•L^-1的浓硫酸与铜共热一段时间后，滤去多余的铜，再将溶液加水稀释到100mL，测得SO₄^2-的物质的量浓度为3.18mol•L^-1，试求：（写出计算过程）

（1）在标准状况下可生成SO₂气体多少升；

（2）稀释后的溶液中CuSO₄的物质的量浓度为多少．

—Peter, is there anything else you want to know about China?

—Yes, I am stll wondering __________ .[ ]

A. how is Chinese paper cut made

B. how was the Great Wall built in ancient times

C. why the Chinese people like to play the dragon dance

D. why do the Chinese people eat rice dumplings at Dragon Boat Festival

何谓嗜酸微生物与耐酸微生物？试举例说明之。

为何要发动多哈回合多边贸易谈判？