皮皮学，免费搜题
登录
搜题
【单选题】
数列 的前n项和为 （ 为常数）,则数列 （ ）A.
是等比数列
B.
当且仅当仅当 等比数列
C.
不是等比数列
D.
当且仅当仅当 等比数列
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】Factores that make the tooth extraction more difficult.
A.
class C ramus
B.
distoangular
C.
divergent curved roots
D.
wide periodontal ligament
【简答题】15选10 作答时输入选项的大写字母即可,如:L Directions: In this section, there is a passage with ten blanks. You are requested to select one word for each blank from a list of choices given in a word bank following the ...
【多选题】When the local anaesthesia of infiltration and block anaesthesia failed, what other injection techniques could be used?
A.
Periodontal ligament injection.
B.
Intraosseous injection.
C.
Intrapulpal injection.
D.
One measure is the use of a stronger local anaesthetic solution.
【简答题】用水蒸气蒸馏测定挥发酸酸含量时,为防止蒸馏水中二氧化碳被蒸出,应在蒸汽发生瓶中加入无CO2蒸馏水和磷酸,在样品瓶中加入少许磷酸,其目的是
【单选题】The roots of a tooth are covered by a tissue that is harder and denser than bone and is called:
A.
gingivae.
B.
cementum.
C.
dentin.
D.
periodontal ligament.
E.
enamel.
【单选题】听力原文：What do you think of sharing a cab to the airport? (A) I think it would be nice. (B) You could buy one at the souvenir shop. (C) My flight is at 5 in the evening. (7)
A.
B.
C.
【简答题】当Num Lock指示灯亮时只能输入大写字母。（ ）
相关题目：