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问题 多项选择题

泡沫、二氧化碳、干粉等灭火系统的抽验，应在符合现行各有关系统设计规范的条件下按实际数量的20%-30%抽验下列控制功能（）。

A、人工启动和紧急切断试验1-3次；

B、与固定灭火设备联动控制的其它设备（包括关闭防火门窗、停止空调风机、关闭防火阀、落下防火幕等）试验1-3次；

C、抽一个防火分区进行喷放试验。

答案

参考答案：A, B, C

单项选择题

Teachers need to be aware of the emotional, intellectual, and physical changes that young adults experience. And they also need to give serious (51) to how they can be best accommodate such changes. Growing bodies need movement and (52) , but not just in ways that emphasize competition. Because they are adjusting to their new bodies and a whole host of new intellectual and emotional challenges, teenagers are especially self-conscious and need the (53) that comes from achieving success and knowing that their accomplishments are admired by others. However, the typical teenage lifestyle is already filled with so much competition that it would be (54) to plan activities in which there are more winners than losers, for example, publishing newsletters with many student-written book reviews, (55) student artwork, and sponsoring book discussion clubs. A variety of small clubs can provide multiple opportunities for leadership, as well as for practice in successful (56) dynamics. Making friends is extremely important to teenagers, and many shy students need the (57) of some kind of organization with a supportive adult (58) visible in the background.

In these activities, it is important to remember that the young teens have (59) attention spans. A variety of activities should be organized (60) participants can remain active as long as they want and then go on to something else without feeling guilty and without letting the other participants down.

60().

A. if only

B. now that

C. so that

D. even if
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单项选择题

肺肿瘤在肺显像中的典型表现为（）

A.99mTc-MAA灌注显像有浓聚区，99mTc-DTPA气溶胶吸入显像有缺损区

B.99mTc-MAA灌注显像有缺损区，99mTc-DTPA气溶胶吸入显像有浓聚区

C.99mTc-MAA灌注显像有缺损区，99mTc-DTPA气溶胶吸入显像无缺损区

D.99mTc-MAA灌注显像有缺损区，99mTc-DTPA气溶胶吸入显像有缺损区

E.99mTc-MAA灌注显得像有浓聚区，99mTc-DTPA气溶胶吸入显像有浓聚区
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