抢救过敏性休克的首选药（）A．肾上腺素 B．间羟胺 C．多巴胺 D．去甲肾上腺素 E

在混凝土拌和物中，保持砂率不变增加砂石用量，可减小混凝土拌和物的流动性。

应用化学平衡移动原理可知，合成氨反应过程中（）操作有利于氨的生成。

A、低温、低压

B、低温、高压

C、高温、低压

D、高温、高压

He’ll never forget his stay in the park ________ he found his cellphone which had gone missing days before.

A．that

B．when

C．where

D．which

—There's a(n) _____ on the board saying that the meeting has been put off.  

—Oh, that's too bad.[ ]

A. advertisement

B. advice

C. letter

D. notice

民事权利能力是指民事主体以自己的名义享有民事权利和承担民事义务的资格。