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【判断题】
蓝牙设备分为三个功率等级,分别是:100mW(毫瓦)、2.5mW、1mW。
A.
正确
B.
错误
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【单选题】With a unified national smart grid, homes and businesses with solar panels on their roofs can act as a small utility company when they have surplus power, meaning they can sell it back into the system...
A.
有了统一的国家智能电网,屋顶上装有太阳能面板的家庭和企业就可以扮演着小型公用事业公司的角色,这就意味着当他们有剩余电力时,可以把电卖给电网。
B.
有了统一的国家智能电网,屋顶上装有太阳能电池板的家庭和企业就可以扮演着小型电力公司的角色,这就意味着当他们有剩余电力时,可以把电卖给电网。
C.
有了统一的国家智能电网,屋顶上装有太阳能的家庭和企业就可以扮演着小型电力公司的角色,这就意味着当他们有剩余电力时,可以把电卖给电网。
D.
在统一的国家智能电网里,屋顶上装有太阳能装置的家庭和企业就可以扮演着小型电力公司的角色,这就意味着当他们有剩余电力时,可以把电卖给系统。
【简答题】已知椭圆C以F 1 (-1,0),F 2 (1,0)为焦点,且离心率 e= 2 2 (Ⅰ)求椭圆C的方程 (Ⅱ)过 M(0 , 2 ) 点斜率为k的直线l 1 与椭圆C有两个不同交点P、Q,求k的范围 (Ⅲ)设椭圆C与x轴正半轴、y轴正半轴的交点分别为A、B,是否存在直线l 1 ,满足(Ⅱ)中的条件且使得向量 OP + OQ 与 AB 垂直?如果存在,写出l 1 的方程;如果不存在,请说明理由
【判断题】Businesses are able to recover VAT on the products and services that they buy when they sell to other businesses or to end consumers.
A.
正确
B.
错误
【单选题】Businesses are more willing to sell a product when the price _____ and less willing to sell it when prices _____.
A.
rises / rise
B.
rises / fall
C.
falls / rise
D.
falls / rise
【单选题】When should businesses that sell gift certificates to customers report revenue?
A.
When the gift certificate is sold and cash is received.
B.
When the gift certificate is used by the customer.
C.
At the end of the year in which the gift certificate is sold.
D.
None of the above.
【单选题】1 “ 只要旅游产品好,不愁没销路 ” ,这种市场营销管理哲学属于 ( ) 。
A.
推销观念
B.
生产观念
C.
产品观念
D.
市场 营销观念
【简答题】Which of the following statements about sales tax is/are true? 1 Sales tax charged on purchases is an expense to a business if the business is not sales taxregistered.2 Sales tax is charged by all bus...
【判断题】Only when they sell their goods or services to final consumers, can businesses recover VAT.
A.
正确
B.
错误
【简答题】已知椭圆 x 2 a 2 + y 2 b 2 =1(a>b>0) 的离心率 e= 2 2 ,短轴长为2. (1)求椭圆方程; (2)若椭圆与x轴正半轴、y轴正半轴的交点分别为A、B,经过点 (0, 2 ) 且斜率k的直线l与椭圆交于不同的两点P、Q.是否存在常数k,使得向量 OP + OQ 与 AB 共线?如果存在,求k的值;如果不存在,请说明理由.
【单选题】Homes and businesses can act __ a small utility company, when they have surplus power,meaning they can sell it back into the system.
A.
for
B.
with
C.
like
D.
as
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