把一根洁净的铁钉放入稀硫酸中,下列叙述不正确的是 A.在铁钉表面产生气泡   B

题型:选择题

问题:

把一根洁净的铁钉放入稀硫酸中,下列叙述不正确的是

A.在铁钉表面产生气泡  

B.溶液由无色逐渐变为浅绿色

C.铁钉的质量增加    

D.溶液的质量增加

考点:金属的化学性质S,Fe,C,P等物质在氧气中的燃烧二氧化碳的性质实验金属活动性
题型:选择题

学龄前期儿童口腔保健的护理要点应除外()

A.在成人指导下学习刷牙

B.每天早、晚刷牙1次

C.不需饭后漱口

D.少吃易致龋齿的食物

E.定期进行口腔保健检查

题型:选择题

电信资源,是指()等用于实现电信功能且有限的资源。

A、无线电频率

B、卫星轨道位置

C、电信网的用户编号

D、电信网的网络编号

题型:选择题

One day while a girl was walking in the woods she found two starving songbirds. She took them home and put them in a small (16) . She cared for them and felt great love for them.
Once the (17) and per of the two birds flew from the cage. Therefore, (18) he flew close, she grasped him (19) . She felt glad, but suddenly she felt the bird go limp. She opened her hand and (20) in horror at the dead bird.
She noticed the other bird moving back and forth on the edge of the cage. She could feel his great need for (21) . She lifted him from the cage and (22) him softly into the air. The bird circled once, twice, three times.
The girl watched delightedly at the bird’s enjoyment. Her heart was no longer (23) with her loss. Suddenly the bird flew closer and (24) softly on her shoulder. It sang the sweetest melody that she had ever heard.
The fastest way to (25) love is to hold on it too tightly, while the best way to keep love is to give it WINGS!

Ⅱ.完型填空/Cloze

A.landed

B.sat

C.slept

D.stood

题型:选择题

土石坝排水设计中,右图所示的排水方式属于()。

A.棱体排水

B.贴坡排水

C.褥垫排水

D.综合式排水

题型:选择题

在使用应急通信仪表时发生故障,不正确的作法是().

A.人为导致仪表故障情节严重的,要严肃处理

B.非人为导致仪表故障的,可以不用查明原因

C.仪表发生故障应及时修理,做好记录。

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