[单选题]The standard meter is accurate to about ____.Ki0答案窝(daanwo.com)-大学生作业答案及考资分享平台 Athree parts in a billionKi0答案窝(daanwo.com)-大学生作业答案及考资分享平台 Bthree part in a billionKi0答案窝(daanwo.com)-大学生作业答案及考资分享平台 Cthree parts in billionKi0答案窝(daanwo.com)-大学生作业答案及考资分享平台 Dthree part in billionKi0答案窝(daanwo.com)-大学生作业答案及考资分享平台