precision targeting

用于描述卫星的几何分布对测量精度影响的精度衰减因子有（）等。 A: AGDOP–Geometry Dilution of Precision，几何精度衰减因子 B: BPDOP–Position Dilution of Precision，位置精度衰减因子 C: CTDOP–Time Dilution of Precision，时间精度衰减因子 D: DHDOP–Horizontal Dilution of Precision，平面精度衰减因子 E: EVDOP–Vertical Dilution of Precision，高程精度衰减因子

用于描述卫星的几何分布对测量精度影响的精度衰减因子有( )等。 A: GDOP - Geometry Dilution of Precision,几何精度衰减因子 B: PDOP - Position Dilution of Precision,位置精度衰减因子 C: TDOP - Time Dilution of Precision,时间精度衰减因子 D: HDOP - Horizontal Dilution of Precision,平面精度衰减因子 E: VDOP - Vertical Dilution of Precision,高程精度衰减因子

有关机器学习分类算法的Precision和Recall，以下定义中正确的是（假定tp = true positive, tn = true negative, fp = false positive, fn = false negative）（ ） A: Precision = tp / (tn + fn), Recall = tp /(tp + fp) B: Precision= tp / (tp + fp), Recall = tp / (tp + fn) C: Precision = tp / (tn + fp), Recall = tp /(tp + fn) D: Precision = tp / (tp + fp), Recall = tp /(tn + fn)

Which of the following statements is ? ( ) A: Java provides two primitive types for storing floating-point numbers in memory float and double. B: A floating-point number is a number with a decimal point. C: Variables of type float represent single-precision floating-point numbers and have seven significant digits. D: Variables of type float represent double-precision floating-point numbers; these require twice as much memory as double variables.

A scientist must be __________ (precision) while performing experiments.

The first of these is correctness and precision in the use of the mother tongue.

数据新闻的英文全程是Precision Journalism.

下面函数pi的功能是:根据以下公式，返回满足精度(0.0005)要求的π值，请填空。 π/2=1+1/3+1/3*2/5+1/3*2/5*3/7+1/3*2/5*3/7*4/9+… #include #include #include double pi(double eps) {double s,t; int n; for(【1】;t>eps;n++) {s+=t; t=n*t/(2*n+1); } return (【2】); } main() {double x; printf("\nPlease enter a precision:"); scanf("%lf",&x); printf("\neps=%lf,π=%lf",x,pi(x)); }

下面函数定义中正确的是 。 A: double fun(double f1, double f2){ } B: double fun(double f1; double f2){ } C: double fun(double f1, double f2); { } D: double fun(double f1, f2){ }