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【单选题】
Riding on the swings and playing with the ducks in the pond _____ our children’s greatest pleasures when we took them to the park.A.
is
B.
were
C.
was
D.
are
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皮皮学刷刷变学霸
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【简答题】培养基的组成物质中,根据其作用的不同,除水作为溶剂外的其他物质可分为( )、( )、( )、( )四类。
【单选题】二元函数 ．的定义域是xOy平面上的区域( )．
A.
x 2 +y 2 ≤1，y 2 ≤4x；
B.
x 2 +y 2 ＜1，y 2 ≤4x，x 2 +y 2 ≠0；
C.
x 2 +y 2 ＜1，y 2 ＜4x；
D.
x 2 +y 2 ≤1，y 2 ＜4x，x 2 +y 2 ≠0．
【判断题】狭义O2O，指的是消费者通过线上平台在线购买并支付/预定某类商品/服务，并线下体验/消费完成交易；消费者在线下体验后通过扫描二维码/移动终端等方式在线上平台购买并支付/预定某类服务/商品
A.
正确
B.
错误
【多选题】Among those which is input VAT deductible? ( )
A.
supply of electricity
B.
supply of water
C.
processing of goods on consignment
D.
supply of natural gas
【单选题】Among those which is not taxable in VAT? ( )
A.
good sales
B.
service provided by the employee to employer
C.
importation of goods
D.
service supplies with compensation
【单选题】函数 y= 2 x 2 x 2 +1 的导数是（ ）
A.
y ′ = y ′ = 4x( x 2 +1)-4 x 2 ( x 2 +1) 2
B.
y ′ = 4x( x 2 +1)-4 x 3 ( x 2 +1) 2
C.
y ′ = 4x( x 2 +1)+4 x 3 ( x 2 +1) 2
D.
y ′ = 4x( x 2 +1)-4 x ( x 2 +1) 2
【多选题】Among those which is input VAT non-deductible? ( )
A.
transportation services provided to passengers
B.
transportation services along with purchased goods which are destroyed due to poor management
C.
purchased goods which are destroyed due to poor management
D.
purchased goods which are destroyed due to natural disaster
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