型号为2FZ35-70的防喷器，其最大工作压力为35MPa。

高压锅是生活中一种密闭的加热容器．锅盖中央有一出气孔，孔上盖有限压阀，当锅内气压达到限定值时，限压阀被锅内顶起放出部分气体，实现了对锅内气体压强的控制．如图所示，某高压锅锅体的内底面积为S，侧壁竖直，出气孔横截面积为S₀，限压阀质量为m₀，限压锅顶部面积为S_t（已知大气压强p₀）

（1）写出液体沸点与气压的关系；

（2）求使用高压锅时锅内气体的最大压强；

（3）为保证使用安全，不可随意增加限压锅质量．如果限压阀的质量增加m，请计算锅体与锅盖咬合处锅体对锅盖的最大作用力增大多少．

转运游离脂肪酸的是( )。

A．免疫球蛋白
B．肌红蛋白
C．脂蛋白
D．铜蓝蛋白
E．清(白)蛋白

如图是某一时刻，太阳光照图，读图完成下列要求：

（1）在图中标出地球自转方向．

（2）此刻，______地正值正午，______地为午夜，______地是黄昏．

（2）6小时后，______地为黄昏，______地为午夜．

Cancer researchers urged people on Wednesday to take more vitamin D to lower risk of cancer， saying studies showed a clear link. "Our suggestion is for people to increase their intake， through diet or a vitamin supplement，" Dr. Cedric Garland said in a telephone interview.

Garland's research team reviewed 63 studies， including several large long-term ones， on the relationship between vitamin D and certain types of cancer worldwide between 1966 and 2004. "There's nothing that has this ability to prevent cancer，" he said， urging governments and public health officials to do more to fortify foods with vitamin D.Garland is part of a University of California at San Diego Moores Cancer Center team that published its findings this week online in the American Journal of Public Health.    Vitamin D is found in milk， as well as in some fortified orange juice， yogurt and cheeses， usually at around 100 international units （IU） a serving. People might want to consider a vitamin supplement to raise their intake to 1000 IUs per day， Garland said， adding that it was well within the safety guidelines established by the National Academy of Sciences.

The authors said that taking more vitamin D could be especially important for people living in northern areas， which receive less vitamin D from sunshine.

African Americans， who don't produce as much of the vitamin because of their skin colour， could also benefit significantly from a higher intake， the authors said.

小题1: According to the passage， people are advised to take more Vitamin D because_________.

A．it is nutritious

B．it can‘t harm people’s health

C．it is not taken enough every day

D．it can lower cancer risk小题2: Which of the following can not help people get more Vitamin D？

A．Have more meat

B．Have some sunshine

C．Have a vitamin supplement

D．Have more fortified cheese小题3:Who can Garland probably be？

A．A scientist

B．A health researcher

C．A doctor

D．A public health official小题4:Which of the following food can lower people‘s chance of getting cancer？

A．Fortified orange juice

B．Milk

C．Fortified yogurt

D．All of the above小题5:People from which area should take more Vitamin D according to the passage？

A．Asian people

B．American people

C．European people

D．African people

以下各项不属于信用证基本当事人的是：

A．开证申请人

B．开证行

C．保兑行

D．信用证受益人