当孔板阀正常工作时,滑阀(),下阀腔压力与上游管内压力相等,上阀腔内压力()大气压。

题型:单项选择题

问题:

当孔板阀正常工作时,滑阀(),下阀腔压力与上游管内压力相等,上阀腔内压力()大气压。

A.打开,大于

B.关闭,等于

C.50%阀位,小于

D.自由开关,大于

考点:输气工考试输气工中级输气工中级题库
题型:单项选择题

在动物世界里,在陆地上奔跑的最快的是猎豹,其速度可达40m/s,而在海洋里游得最快的是旗鱼,其速度可达100km/h,在空中飞行得最快的要算小巧的雨燕,其速度可达3km/min,你认为谁是地球上速度最快的动物?

题型:单项选择题

短文填空

Restaurant owners have to know how    1    (make)food. They also have to

know how to make money. Here are some things they  2   (learn)from scientific studies . The color red makes people hungry . Red also makes customers   3   (eat) faster. Many fast food restaurant, therefore , have red furniture or walls. Soft colors like pink and light blue make people   4 (relax),so they spend more time   5   (eat) their meals. Soft lighting makes people look good , but it makes food look bad.. Loud music may be nice at first, but it soon makes people want  6    (leave). Hard seats also make customers want to eat quickly and  7    (leave) . Many restaurants, especially fast food restaurants,  8   (use) this knowledge to make customers eat faster. Because customers    9    (stay) very long, small restaurants can   10     (serve) many people every day .

题型:单项选择题

自20世纪80年代以来,香港劳动密集型的制造工业大量迁往内地,据此回答问题。

小题1:关于这种产业迁移说法正确的:

A.是第三产业的迁移

B.是技术指向型产业的迁移

C.阻碍了迁入地的城市化进程  

D.可能对迁入地的环境造成污染小题2:香港制造业迁移的原因有

①香港地价高 ②内地服务业发达  ③内地工资水平较低  ④香港人口数量剧减

A.①②   

B.①③   

C.③②   

D.②④

题型:单项选择题

在进行图像编辑时,在【通道】面板中单击按钮创建的新通道都是()。

A.复合通道

B.专色通道

C.颜色通道

D.Alpha通道

题型:单项选择题

以下所列单据,出境报检时无须提供的是______。

A.外贸合同
B.发票
C.提(运)单
D.装箱单

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