探伤灵敏度余量的测定,仪器和探头的噪声电平应调至()以下。
A、10%
B、20%
C、5%
D、30%
参考答案:A
Neither side is prepared to talk to ________ unless we can smooth things over between them.[ ]
A. others
B. the other
C. another
D. one other
按照规定的条件保存样品,并应于采样后一周内分析完毕。