“'goodidea'.match(/\s../gi)”的匹配结果为["id"]。()

下列选项中,返回值等于0的是()。 A: [\s+]/g.lastIndex B: 'jscss'.match(/\s../gi) C: '123*abc.456'.search('.*') D: ^[a-z]\d/gi.exec('12DC')

U.S. President and the President of Indonesia agreed to Mr. Obama may cut short his visit in Jakarta because of A: religious demonstrations. B: killing in the city. C: emergency in the U. S.. D: natural disasters.

Choose the best topic sentence from the four options below. Write the corresponding letter of your choice on the Answer Sheet. A: Thousands of scholars and students have gone to foreign countries to study. B: Many people are sparing no effort in applying for going abroad. C: A large number of people went to the U. S.. D: In recent years, studying abroad had flourished.

机械零件的强度条件可以写成____。 A: σ≤[σ],τ≤[τ]或Sσ≤[S]σ,Sτ≤[S]τ B: σ≥[σ],τ≥[τ]或Sσ≥[S]σ,Sτ≥[S]τ C: σ≤[σ],τ≤[τ]或Sσ≥[S]σ,Sτ≥[S]τ D: σ≥[σ],τ≥[τ]或Sσ≤[S]σ,Sτ≤[S]τ

球面镜的物距为s，象距为s′，则横向放大率为（）。 A: s′/s B: s/s′ C: -s′/s D: -s/s′

【单选题】在压力为 p 时 ,饱和水的熵为 s ′;干饱和蒸汽的熵为 s ′′。当湿蒸汽的干度0 <x<1 时 ,其熵为 s ,则() A.s′′ >s>s ′ B.s>s ′′> s ′ C.s<s ′ <s ′′ D. s ′ >s>s ′′ A. s″ >s>s ′ B. s>s ″> s ′ C. s ′ ″ D. s ′ >s>s ″

【单选题】下列分子的构型(R/S)是 () A. S,S,R B. S,S,S C. S,R,S D. R,S,S

下述对命题“若S ≠Ø， S×A ⊆ S×B ，则 A ⊆ B”，那个论证是正确的？ A: 对∀a∊A，因为S ≠Ø， 存在s∊S，使∊ S×A，由S×A ⊆ S×B ，知∊ S×B，得a∊B。 B: 对∀∊ S×A，有a∊A。因为S×A ⊆ S×B ，知∊ S×B，得a∊B。 C: 对∀s∊ S，有a∊A，所以∊ S×A。因为S×A ⊆ S×B ，所以∊ S×B。

以下正确的程序段是: char *s; scanf("%s", s);|char s[20], *t=s;scanf("%s", t[2]);|char s[20]; scanf("%s", &s);|char s[20]; scanf("%s", &s[2]);