小伟同学参加军训时，体检称得他的质量为50kg，他立正时对水平地面的压力为 N；

The earth moves round the sun ,and the moon goes round the earth .When our part（部分）of the earth turns to the sun ,it is day ,When our part of the earth turns away from the sun ,it is night. The sun is much bigger than the moon .But sometimes the moon looks bigger than the sun, because it’s much nearer to the earth. The sun is very bright .It gives a very strong light .The moon looks quite bright, too .But it doesn’t give any light at all. The moon looks much bigger and brighter than the stars .But actually（事实上）, the stars are much bigger and brighter than the moon .They look smaller than the moon because they’re much farther away from us.

小题1:Sometimes the moon looks bigger than the sun, because______.

A．it is much bigger than the sun

B．it comes out only at night

C．it is much nearer to the earth than the sun

D．it doesn’t give a very strong light小题2:The stars ______.

A．look much bigger than the sun

B．look much brighter than the moon

C．are a lot brighter than the moon, but they are not bigger than the moon

D．are much farther away from us than the moon小题3:When it is day, _______.

A．our part of the earth turns to（转到）the moon

B．the sun looks much smaller than the stars

C．we can’t see any stars in the sky.

D．the moon turns away from the sun

当压力表所测介质具有高温时，安装压力表时为（）直接进入压力表，必须在压力表前加装（）。

气候变化预估与应对工作的重点任务是（）.

A.加强气候系统各圈层相互作用及人类活动影响区域气候的分析研究

B.发展气候变化对经济社会各部门影响的评估模式，并建立相应业务系统和应对业务系统

C.分析气候与气候变化对重大工程建设的影响，提供更具针对性的适应、减缓对策和更具针对性的气象保障对策

D.发展有中国特色的气候系统模式以预测10年以上长期气候变化趋势，提出具有权威性的中国未来20-100年气候变化情景

男性，8岁。因牙龈及口腔黏膜坏死溃烂1周，伴高烧10天来诊。经检查初步诊断为坏死性龈口炎。口腔局部治疗时，以下哪种药物不适用

A．3%过氧化氢

B．1%甲紫

C．10%硝酸银

D．牙周塞制剂

E．养阴生肌散或冰硼散

AGP插槽插的组件是（）