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【单选题】
表示零件之间装配关系的尺寸是( )A.
装配尺寸
B.
性能规格尺寸
C.
安装尺寸
D.
外形尺寸
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举一反三
【简答题】Both his health and his businesses within a year, but both recovered miraculously two years later.
【简答题】已知 是首项为19，公差为-2的等差数列， 为 的前n项和。 （Ⅰ）求通项 及 ； （Ⅱ）设 是首项为1，公比为3的等比数列，求数列 的通项公式及其前n项和
【简答题】直接写出得数． 0.9×8= 1.1×8= 0.25×4= 0.15×40= 2.5×2= 1.25×8= 0.75×2= 12.5×2=
【简答题】直接写出得数。 2.2-1.7= 0.9×99+0.9= 0.25×40= 400÷25÷8= 10- = （ + ）×30=
【简答题】直接写得数。 0.9×99+0.9= 0.25×40= 9.9÷ = 400÷25÷8= 4÷8= - = -0.75-25%= 10- = 1÷ × = 8.75-（3.6+0.75）=
【简答题】（本题满分12分） 已知数列 是首项为1的等差数列，其公差 ，且 ， ， 成等比数列. （1）求数列 的通项公式； （2）设数列 的前n项和为 ，求 的最大值.
【单选题】Both his health and his business ________ in a year because of taking drugs.
A.
cracked
B.
crashed
C.
collapsed
D.
collided
【单选题】Could you find out the euphemism in the following sentence: “He was both out of pocket and out of spirits by that catastrophe, failed in his health and prophesied the speedy ruin of the empire”?
A.
Out of pocket
B.
out of spirits
C.
prophesied
【多选题】Listen to D2 and choose the information you hear. A Steven introduces his friends to Betty. B Both Betty and David like table tennis. C David thinks that climbing mountains is good for health. D Betty...
A.
Steven introduces his friends to Betty.
B.
Both Betty and David like table tennis.
C.
David thinks that climbing mountains is good for health.
D.
Betty suggests that they watch a table tennis match next weekend.
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