膀胱造影的术前准备，不包括A．排尿 B．清洁肠道 C．备好导尿管 D．将对比剂加热至

牙周炎除四大症状外，晚期伴发症状是( )

A．牙周袋形成
B．牙龈炎症
C．牙槽骨吸收
D．牙移位
E．牙齿松动

Scientists are trying to make the deserts into good land again. They want to bring water to the deserts， so people can live and grow food. They are learning a lot about the deserts. But more and more of the earth is becoming desert all the time. Scientists may not be able to change the desert in time.

Why is more and more land becoming desert？ Scientists think that people make deserts. People are doing bad things to the earth.

Some places on the earth don’t get much rain. But they still don’t become deserts. This is because some green plants are growing there. Small green plants and grass are very important to dry places. Plants don’t let the sun make the earth even drier. Plants do not let the wind blow(吹) the dirt away. When a bit of rain falls， the plants hold the water. Without plants， the land can become desert more easily.

小题1: Deserts ________.

A．never have any plants or animals in them

B．can all be turned into good land before long

C．are becoming smaller and smaller

D．get very little rain小题2: Small green plants are very important to dry places because __________.

A．they don’t let the sun make the earth even drier

B．they don’t let the wind blow the soil away

C．they hold water

D．All of the above.小题3: After reading this passage, we learn that __________.

A．plants can keep dry land from becoming desert

B．it is good to get rid of the grass in the deserts

C．all places without much rain will become deserts

D．it is better to grow crops on dry land than to cut them

火柴头上通常含有氯酸钾、二氧化锰、硫等物质。某研究性学习小组进行火柴头中有关物质的实验探究。

（1）检验火柴头中含有硫 将两根火柴放在如下图所示实验装置中漏斗下面，用一根燃着的火柴点燃，慢慢拉动注射器活塞抽气，让火柴燃烧产生的气体通过稀品红溶液，观察到品红溶液褪色。据此回答下列问题：

①燃烧产生的气体中一定含有___________

②可用于替代试管中品红溶液的试剂有___________（填标号）

A．稀高锰酸钾酸性溶液 B．饱和石灰水 C．稀溴水 D．烧碱溶液

③某同学提出用如下图所示方法进行实验更为简便。他的操作是：

ⅰ、当图中所示火柴头燃烧完，立即移出火柴；

ⅱ、__________________________

（2）测定火柴头中氯酸钾的含量主要实验步骤如下：

ⅰ、刮取火柴头，小心研碎，称得质量为2.45g；

ⅱ、用适量蒸馏水充分浸泡后过滤、洗涤残渣；

ⅲ、往装有滤液和洗涤液的烧杯中加入过量的NaNO₂溶液、AgNO₃溶液和稀硝酸，搅拌，充分反应后，过滤、洗涤沉淀；

ⅳ、干燥沉淀物，称得其质量为1.435g

①实验中发生的反应是：KClO₃+3NaNO₂+AgNO₃==AgCl↓+3NaNO₃+KNO₃其中NaNO₂是_______剂；反应中AgNO₃、NaNO₂均需要过量的原因是_______________________

②实验测得火柴头中KClO₃的质量分数为_______________

③如果第ⅱ步中未洗涤残渣，测得KClO₃的质量分数将____________（填偏大、偏小或无影响，下同）；如果第ⅲ步中，未洗涤AgCl沉淀，测得KClO₃的质量分数将____________

三十五岁孕妇，孕2产0，停经34⁺周，阵发性夜间胸闷、气短2天入院。有风湿性心脏病史，30岁时行二尖瓣球囊扩张术，术后心功能2级。查体：血压100／75mmHg，心率120次／分，呼吸20次／分。下肢凹陷性水肿+，心脏听诊闻及ll级舒张期杂音，肺底闻及少许湿啰音。胎心率150次／分，无宫缩。

该患者的诊断首先考虑是（）

A.妊娠合并风湿性心脏病

B.妊娠合并风湿性心脏病早期心衰

C.妊娠合并肾炎

D.重度子痫前期

E.妊娠高血压心衰

施工企业应按照岗位任职条件的要求，采用（）措施配置人力资源，以满足质量管理对人力资源配置的需求。

A.内外部招聘

B.调换岗位

C.培训

D.职系调整