皮皮学，免费搜题
登录
搜题
【单选题】
RC文氏桥振荡电路的起振条件是,放大器的放大倍数Au>( )。A.
1/3
B.
3
C.
1/2
D.
2
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
【单选题】_____on the grass _____singing and laughing.
A.
Seated ; is some students
B.
Seated ; are some students
C.
Sitting ; is some students
D.
Sitting ; some students are
【简答题】_________________________________should be stowed under the seat as quickly as possible and________________ clear for others to be seated.
【单选题】If the price of oak lumber increases, what happens to consumer surplus in the market for oak cabinets?
A.
a. Consumer surplus increases.
B.
b. Consumer surplus decreases.
C.
c. Consumer surplus will not change consumer surplus; only producer surplus changes.
D.
d. Consumer surplus depends on what event led to the increase in the price of oak lumber.
相关题目：