常模样本中6年级的算术平均分为35分，某儿童在算术测验中得35分，该儿童的算术年级当量是（）年级水平。
A.5
B.6
C.7
D.8
参考答案：B
The song "In Spring"___ original singer is Wang Feng has brought national fame to Xuriyanggang, ____
won the second place in the 2010 Avenue of Stars Finals. [ ]
A. who; whose
B. which; who
C. whose; who
D. of whom; who
增大刀具前角的主要影响是（）。
A.控制切屑流出方向
B.使刀刃锋利，减小切削变形
C.影响刀尖强度及散热情况
D.影响各切削分力的分配比例
E.减小刀屑间的摩擦，降低切削力
