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【多选题】
下列关于国际邮件的封面书写说法正确的有（）。A.
收件人名址应写在邮件封面中间靠右偏下位置，与邮件长度方向平行
B.
寄件人的姓名、地址应当写在邮件封面的左上角或者写在邮件的背面
C.
收件人名址书写顺序的第二行写街道名和门牌号码
D.
寄达地名和寄达国名应用大写字母书写
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【单选题】On a tank vessel, which of the following substances would be burning in a class 'B' fire?
A.
Oil
B.
Wood
C.
Rags
D.
Electrical wiring
【单选题】设常数p＞0，则幂级数 在其收敛区间的右端点处是( )．
A.
条件收敛的
B.
绝对收敛的
C.
当0＜p≤1时为条件收敛，当p＞1时为绝对收敛
D.
当0＜p≤1时为绝对收敛，当p＞1时为条件收敛
【单选题】What did Bill Gates do at Harvard University?
A.
He developed a small computer to measure raffic flow,
B.
He formed the "Programmers Group" at Harvard Univerity.
C.
He apent many Jong nights. in. front. of the. achool's, computer.
D.
He discussed with his clssmates about staring a new business.
【单选题】What did Bill Gates do at Harvard University?
A.
He developed a small computer to measure traffic flow.
B.
He formed the “ Programmers Group ” at Harvard University.
C.
He spent many long nights in front of the school ’ s computer.
D.
He discussed with his classmates about starting a new business.
【单选题】设幂级数在处收敛，则此级数在处( ). A．条件收敛 B．绝对收敛 C．发散 D．收敛性不能确定
A.
设幂级数 ∑an(x-1)^n在x=-1 处收敛，则此级数在 x=2 处( ). A．条件收敛
B.
绝对收敛
C.
发散
D.
收敛性不能确定
【单选题】What did Bill Gates do at Harvard University?
A.
He developed a small computer to measure traffic now .
B.
He formed the “Programmers Group” at Harvard University .
C.
He spent many long nights in front of the school’s computer .
D.
He discussed with his classmates about starting a new business .
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