【简答题】已知等差数列{a n }的前四项的和为60,第二项与第四项的和为34,等比数列{b n }的前四项的和为120,第二项与第四项的和为90, (Ⅰ)求数列{a n },{b n }的通项公式; (Ⅱ)设 ,则数列{c n }中的每一项是否都是数列{a n }中的项,给出你的结论,并说明理由.
【单选题】两个正弦量为i1=20sin(628t-30°)A, i2=40sin(628t-60°)A,则( )
【单选题】两个正弦量为i1=20sin(628t-30o)A,i2=40sin(628t-60o)A,则( )。
【简答题】我国规定的安全色为____、__、__和___四种。对比色为___和___两种。
【单选题】An asset created by prepayment of an expense is:
A.
Recorded as a debit to an unearned revenue account.
B.
Recorded as a credit to a prepaid expense account.
C.
Recorded as a credit to an unearned revenue account.
D.
Recorded as a debit to a prepaid expense account.
E.
Not recorded in the accounting records until the earnings process is complete.
【单选题】An asset created by prepayment of an expense is____________.
A.
recorded as a debit to an unearned revenue account
B.
recorded as a debit to a prepaid expense account
C.
recorded as a credit to an unearned revenue account
D.
recorded as a credit to a prepaid expense account
E.
not recorded in the accounting records until the earnings process is complete
【单选题】以下属于现实主义创作方法创作的艺术作品是:
【简答题】如图,分别以四边形ABCD的四个顶点为圆心,以3为半径画弧,则图中四个阴影部分面积和为______.
【判断题】《查波罗斯人写信给苏丹王》视觉中心在写信人的周围。