下列哪项不支持房间隔缺损的诊断（） A.胸骨左缘2～3肋间有杂音 B.肺动脉瓣区第二

某新建办公建筑，地上共29层，层高均为5m，地下共2层，其中地下二层为汽车库，地下一层机电设备用房并设有电信进线机房，裙房共4层，5～29层为开敞办公空间，每层开敞办公面积为1200m2，各层平面相同，各层弱电竖井位置均上下对应，请回答下列问题：

如果选用T528W荧光灯，每个灯管配置的镇流器功率5W，计算最小源数量（不考虑灯具平面布置）应为下列哪项数值？（）并判断是否低于国家规定的照明功率密度值（）。（查T528W光源光通量为26001m，灯具维护系数利用系数为0.58）

A.19盏，是

B.25盏，是

C.31盏，是

D.31盏，否

To me, the ocean is our greatest wilderness. I love swimming in it , surfing its waves, watching it from shore and thinking about all the life living unseen under the surface.

When I take my little kids to check out tide pools, we’re overjoyed when we find a sea star or some shellfish. Lately, though, I've noticed a change in my favorite pools: there are more sea grasses and fewer animals with shells.

I can't help feeling these small changes portend something more troubling about our oceans. It matches what scientists are telling us: our oceans are being troubled by carbon dioxide that threatens corals, colorful fish, salmon, sea otters, even whales. Our oceans are facing a major change.

Every hour, a million tons of carbon dioxide from cars, factories and power plants rain down on the world’s oceans. Carbon pollution brings about a chemical reaction that turns sea water more acidic (酸的) and takes away things important for sea animals .

Some of us are already feeling the effects of this growing crisis（危机）. Shellfish farmers in the Pacific Northwest have reported a decrease in natural and farmed oysters(牡蛎). Just this week, a new studyproved the link between the huge reduction in the numbers of oysters and ocean acidification. As polar waters become more acidic, Alaskan fishermen are troubled by the future of smaller fish.

Without action, ocean acidification will have a disastrous influence on the food chain, affecting not only sea life but the people who depend on it for food and their living. Already, our oceans have become 30 percent more acidic since preindustrial times, and it gets worse every day. We can stop this frightening dream, but only if we act now.

That's why the Center for Biological Diversity has started a petition (请愿书) requesting President Obama and the Environmental Protection Agency to develop a plan to deal with ocean acidification. Decisive action can save sea life as we know it.

Now it isn’t too late to save our oceans and sea life. With immediate action to reduce carbon dioxide release we can start taking important steps today to deal with this disastrous situation. Join me in our petition calling for a national plan to save our oceans.

小题1:The author’s recent visits to the tide pool brought her ___ .

A．happiness

B．anger

C．concern

D．comfort小题2:The underlined word “portend” in Paragraph 3 probably means ___ .

A．predict

B．prevent

C．replace

D．reduce小题3:What the author worries about most is ____ .

A．the harm of sea grasses

B．carbon pollution in the sea

C．that the petition may be turned down

D．how fishermen can make a living in the future小题4:What is the main purpose of the text ?

A．To inform.

B．To educate.

C．To persuade .

D．To instruct.

近年来，我国近海渔业产量呈现下降趋势，主要的原因是

A．厄尔尼诺现象导致气候异常

B．全球气温升高，海洋蒸发量增大

C．过度捕捞活动造成渔业资源衰减

D．建立人工岛和海港设施等产生的不良影响

地面测距设备的工作频率范围是（）MHz。

A.1025-1150

B.1024-1150

C.962-1213

D.962-1214

收音机可能在（）中遇到严重颠簸。