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
搜题请搜索小程序“爱下问搜题”
— 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：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