在规定条件下进行多次称量时，所得结果的符号程度称为称量的（）.
A、正确度
B、重复性
C、稳定性
D、精密度
参考答案：D
草履虫的结构中直接与水接触的是[ ]
A．细胞壁
B．表膜
C．细胞质
D．荚膜
— Who should be responsible for the accident?
— The boss, not the workers. They just carry out the order _____. [ ]
A. as told
B. as are told
C. as telling
D. as they told
