When it started to snow, we turned round a

写出甲烷化反应方程式，并说明反应条件。

(2013·日照一模)—What has made John look like lacking sleep?

—________ he had to prepare for the coming exam and stayed up last night.

A．For

B．Because

C．That

D．What

癫痫复杂部分性发作治疗首选

A．ACTH
B．丙戊酸
C．地西泮
D．卡马西平
E．水合氯醛

设备退出后如何重新投运？

暂时硬度：指水在长期（）后可以沉淀去掉的那一部分硬度。

A.密度杯

B.耐热性

C.电化学作用

D.煮沸