水冷塔在水和干燥污氮气、氮气直接接触过程中，由于水的气化需要吸收大量的汽化潜热，从而

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     The lecture on (1)__________(smoke) was over at last. While we boys (2)__________(rush)

towards the playground, Jim passed by the table. The watch, which Mrs. Smith had laid on the table

when she started her lecture, disappeared. We were going back for class again when the headmaster

(3)__________(call) us together and said, "I've got a little job for you boys. Mrs. Smith has just lost

her watch on the playground.

     This kind of thing (4)__________(happen) before." He said," It just fell off her wrist(手腕). So, look

around for it, will you? (5)__________(see) ff you're clever enough for it. You (6)__________(get) a

useful reward."

     At once we started looking for the watch. Everybody wished to be the lucky one. Suddenly, Jim

(7)__________(stop) and bent(弯) down as if to pick up something. And the next moment he was in

front of Mrs. Smith, all smile, turning in the watch to her. Mrs. Smith, however, (8)__________(not be)

pleased at all. In fact, she looked angry. She took the watch without even a "Thank you. "

     Jim got his reward ---a large piece of paper from the headmaster. He told Jim (9)__________(write) a

composition on the danger of smoking. What (10)__________(can) poor boy Jim write about? He hadn't

listen to the lecture and had nothing to say on the lecture.

真空中有两个静止的点电荷，它们之间的相互作用力F，若它们的带电量都增大为原来的

1

2

倍，距离减少为原来的

1

2

，它们之间的相互作用力变为（　　）

A．

F

2

B．F

C．4F

D．16F

麻醉期间引起心肌氧耗增加或心肌缺氧的原因哪项不确切（）。

A.病人精神紧张、恐惧和疼痛

B.血压偏低

C.麻醉期间供氧不足

D.各种原因引起的心率加快

E.麻醉药对心肌收缩力的抑制使心排血量减少

旅客托运行李时，必须提出有效的客票和（）。

A、包裹票

B、行李票

C、托运单

D、货签

老年人的皮肤，由于真皮的弹力纤维变性断裂，弹性下降，加之皮肤血运较差而呈（）

A、红色

B、黄色

C、棕色

D、浅绿色