微观不平度十点高度是在取样长度内，10个最大的轮廓峰高和（）最大的轮廓谷深的平均值之和。
A.5个
B.10个
C.15个
D.20个
参考答案：B
I________ the French written papers but failed in the English oral examination. [ ]
A. got through
B. looked through
C. went through
D. lived through
苏联D-81TM式125毫米滑膛炮采用了自动装弹机，其射速可达多少发每分钟（）
A.5
B.8
C.10
D.15
