读图,回答问题。 小题1:关于坡面与侵蚀强度关系的正确叙述是 A.坡度20度时

题型:选择题

问题:

读图,回答问题。

小题1:关于坡面与侵蚀强度关系的正确叙述是

A.坡度20度时,坡面侵蚀强度最大

B.20-40度之间坡面侵蚀强度随坡度的增加而增加得最快

C.40度的坡面侵蚀强度最大

D.90度的坡面侵蚀强度最大小题2:在40-90度之间,坡面侵蚀强度随坡度的增加而减小的原因,叙述正确的是

A.植被破坏的程度较轻

B.降水量少,且强度小

C.坡面径流流速小

D.受雨面积减小,而使坡面流量减小

考点:中国区域生态环境问题中国区域环境问题防治生态系统与生态平衡
题型:选择题

彩色多普勒超声对下列疾病诊断最有价值的是()

A.异位妊娠

B.子宫肌瘤

C.绒毛膜癌

D.胎盘早期剥离

E.子宫肌腺病

题型:选择题

下列哪项不是诊断脑震荡的依据

A.伤后立即出现意识障碍

B.伤后逆行性遗忘

C.意识障碍期间可有皮肤苍白,血压下降,呼吸浅慢

D.清醒后头痛,恶心,呕吐

E.脑脊液红细胞阳性

题型:选择题

Dear Amy,

I have a problem and I’m writing ask you 1. ()

for an advice. This is a secret, so l don’t tell anybody else. 2. ()

My cousin and I used to getting along very well and 3. ()

we were good friend. We were planning to spend 4. ()

part of the winter holiday together, but now 5.()

I don’t think I want to invite her home. 6. ()

Recently I has discovered that he’s started to tell 7. ()

lies. When I told him this was wrong to tell lies, 8. ()

but he just laughed at me. The problem is, should I 9. ()

tell his parents or his teacher, or should I keep quietly. 10. ()

第(3)空应将()

题型:选择题

若从某一初态经可逆与不可逆两条途径到达同一终态,则不可逆途径的△S必()可逆过程△S。

A.大于

B.等于

C.小于

D.大于等于

题型:选择题

子管的敷设安装,数量根据管孔直径及工程需要确定。数根子管的总等效外径宜不大于管孔内径的()。

A.70%

B.80%

C.90%

D.100%

更多题库