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【多选题】
矢量数据压缩的基本原则包括（ ）。A.
最好地逼近原集合
B.
取得尽可能大的压缩比
C.
保持矢量文件格式
D.
保持密度对比
E.
保持空间关系正确
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【单选题】对颧突的描述，不正确的是（ ）
A.
表面覆盖的粘膜薄
B.
位于口腔前庭
C.
颧突的位置可接近牙槽嵴顶
D.
为上颌第一前磨牙根尖部的骨突起
E.
与之相应的基托组织面应做缓冲
【单选题】Passage Four Have you ever heard of a flower whose seeds are carried and spread by elephants? The rafflesia, a rare blossom, is very unusual. Found in the rain forests of Sumatra, the rafflesia is the...
A.
provide food for the giant flower
B.
water the rafflesia with their trunks
C.
carry rafflesia seeds from one place to another
D.
stomp out the awful smelling petals
【多选题】关于暗龙骨吊顶工程施工技术要点中下列叙述错误的是 ( ) 。
A.
安装前，应按设计要求对房间净高、洞口标高和吊顶管道、设备及其支架的标高进行交接检验
B.
吊顶工程的木吊杆、木龙骨和木饰面板必须进行防火处理，并应符合有关设计防火规范的规定
C.
主龙骨起拱高度为房间短向跨度的 l‰ － 3‰ ，吊杆距主龙骨端部距离不得不小于 300mm ；当吊杆长度小于 1.5m 时，应设置反支撑
D.
金属吊杆，龙骨应经过表面防腐处理；木吊杆、龙骨应进行防腐、防火处理
E.
石膏板的接缝应按其施工工艺标准进行板缝防裂处理安装双层石膏板时，面层板与基层板接缝可以在任意处，无须错开
【简答题】The orderly came back in a few minutes with a rifle（步枪）and some Burmans. He told us that the elephant was in the rice fields below, only a few hundred yards away. As I started forward practically the ...
【单选题】下列叙述中哪条与磺胺类药物不符
A.
苯环上的氨基与磺酰胺基必需处在对位
B.
苯环被其他环取代则抑菌作用消失
C.
N1的一个氢被杂环取代时有较好的疗效
D.
为二氢叶酸还原酶的抑制剂
E.
抑菌作用与化合物的pKa有密切关系
【单选题】Most of the elephants you see are Indian elephants. But sometimes you see an African elephant. You can easily tell the two apart by looking at their ears. African elephants have ears at least twice as...
A.
They live to the south of the Sahara.
B.
They can be divided into two species.
C.
They are all larger than Indian elephants.
D.
They have bigger ears than the Indian elephants.
【单选题】Where does most knowledge of Asian elephants come from?'
A.
From the captured or tamed elephants.
B.
From the British wildlife protection group.
C.
From elephant hunters in Thailand and Burma.
D.
From tourists visiting the Thai-Burmese border.
【简答题】句型转换。 1. He likes elephants because they are interesting (就画线部分提问) _______ _______ he _______ elephants? 2. She likes pandas best of all the animals. (变为同义句) _______ _______ _______ is pandas. 3. Tim ...
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