某單位對收集的100個數據已算出其算術平均值為E，方差為D。如果這100個數據中每個數據都增加1倍，方差為()。
A、DC
暫無解析
Iaskedhimto________meafewminutessothatwecouldgooveralltheproblems.
Johnsonwas________unknownbeforerunningforthepresidency.
Eachofusshould_______asideafewminutestohavearesteveryday.
英語翻譯：thescienceofbioticcontrol
—Davidhasmadegreatprogressrecently.—_______，and_______.
