问题
选择题
— Would you mind ______ my pet dog while I'm away?
— Certainly not. [ ]
A. take care
B. take care of
C. to take care of
D. taking care of
答案
答案:D
— Would you mind ______ my pet dog while I'm away?
— Certainly not. [ ]
A. take care
B. take care of
C. to take care of
D. taking care of
答案:D
(由单选和多选组成)
测量结果受到多种因素的影响。为了达到测量的预定要求,测量仪器必须具有符合规范要求的计量学特性。 |
砝码质量的标称值为200mg,而其约定真值为199.994mg,则示值误差等于( )。
A.-60μg
B.-6μg
C.6μg
D.60μg