在种子净度分析中,如果某种组分检测值为零时,则填报().
A、—0.0—
B、—0—
C、未检出
D、TR
参考答案:A
_____, Carolina couldn't get the door open. [ ]
A. Might she as try
B. As she might try
C. She might as try
D. Try as she might
在齿轮尺寸和材料都相同的条件下,圆弧齿轮的承载能力可以比渐开线齿轮提高()倍。
A、8~10
B、1.5~2
C、3~5
D、5~6