LCD1602 液晶屏上显示52，下面操作正确的是（ ）。 A: LcdWriteData（’52’）; B: LcdWriteData（52）; C: LcdWriteData（5）; LcdWriteData（2）; D: LcdWriteData（’5’）; LcdWriteData（’2’）;

(52)10＝( )2＝( )8421BCD码( )16

【单选题】一副 52 张的扑克牌(无大王和小王),从中任意取出一张,共有 52 种等可能的结果 . 求抽到A 的概率 ? . A. 1/52 B. 2/52 C. 3/52 D. 1/13

试题（52）针对下列程序段，需要（52）个测试用例才可以满足语句覆盖的要求。（52） A: 2 B: 3 C: 4 D: 5

Fill in the blankFor the expressionf(t)=tε(t)+2ε(t−2)−tε(t−2),f(3)=______ .

下列程序的运行结果是（ ）。t = 0 while t < 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

一阶常微分方程[img=152x26]1802e4d6075ee4f.png[/img]的通解为 A: sin(2*t)/5-cos(2*t)/10+C*exp(-4*t) B: sin(2*t)/7+cos(2*t)/5-C*exp(-3*t) C: sin(2*t)/7-C*cos(2*t)/10+C*exp(-2*t) D: sin(2*t)/7-cos(2*t)/7+C*exp(-5*t)

已知向量组\(\alpha_{1}=(1,1,2)^T,\alpha_{2}=(3,t,1)^T,\alpha_{3}=(0,2,-t)^T,\)线性相关\(，\)则\(t\)=\(（ \quad ）\)。 A: 、\(t=5\)或\(t=-2\) B: 、\(t=5\)或\(t=2\) C: 、\(t=-5\)或\(t=2\) D: 、\(t=1\)或\(t=-2\)

如果某设计好的引物长度为18bp，A和T一共10bp，Tm温度为？（提示：Tm=2(A+T)+4(G+C)） A: 56 B: 54 C: 52 D: 47

求微分方程[img=269x55]17da6536a9fba07.png[/img]的通解； （ ） A: (C15*sin(2*t))/exp(3*t) + (C16*sin(2*t))/exp(3*t) B: (C15*cos(2*t))/exp(3*t) - (C16*sin(2*t))/exp(3*t) C: (C15*cos(2*t))/exp(3*t) + (C16*cos(2*t))/exp(3*t) D: (C15*cos(2*t))/exp(3*t) + (C16*sin(2*t))/exp(3*t)