【单选题】当表面活性剂加入溶剂后,所产生的结果是: A. dγ/da<0,正吸附; B. dγ/da<0,负吸附; C. dγ/da>0,正吸附; D. dγ/da>0,负吸附

在草本花卉中，有多少种是观叶类植物？ A: 84 B: 74 C: 94 D: 64 E: 54

让步模式可概括为（）。 A: 26/20/10/4 B: 50/0/-1/0 C: 55/0/0/5 D: 0/0/0/60 E: 8/13/17/22

【单选题】汉字区位码分别用十进制的区号和位号表示,其区号和位号的范围分别是 A. 1 ～ 94 ， 1 ～ 94 B. 1 ～ 95 ， 1 ～ 95 C. 0 ～ 94 ， 94 ～ 0 D. 0 ～ 94 ， 1 ～95

向量（12, 5, 0）的2范数是（ ） A: 13 B: 12 C: 17 D: 0

直线l经过P(2，＝5)，且点A(3，－2)和点B(－1，6)到l得距离之比为1：2，则直线l方程是( )． A: χ＋y＋3＝0或17χ＋y－29＝0 B: 2χ－y－9—0或17χ＋y－29＝0 C: χ＋y＋3＝0 D: 17χ＋y－29＝0 E: 以上结论均不正确

标准麻花钻横刃处前角为（ ）。 A: -54°～-60° B: -10°～-20° C: 0° D: 5°

一般纳税人适用的税率包括()。 A: 17% B: 5% C: 13% D: 0

month.abb&#91;1:2&#93;表示的是？ A: "Feb" "Mar" B: "Jan" "Feb" C: "January" "February" D: "February" "March"

下列程序的运行结果是（ ）。t = 0 while t &lt; 5: print(t, " is less than 5") t = t + 1else: print(t, " is not less than 5") A: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 55 is not less than 5 B: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 55 is not less than 5 C: 0 is less than 51 is less than 52 is less than 53 is less than 54 is less than 5 D: 1 is less than 52 is less than 53 is less than 54 is less than 55 is less than 5