根据现况调查资料可计算出()
A.发病率
B.患病率
C.死亡率
D.治愈率
E.病死率
参考答案:B
表面粗糙度代号上数字的单位为(),数字后有“max”表示其Ra()的大小。
A.μm/上限值
B.mm/上限值
C.mm/最大值
D.μm/最大值
The less the surface of the ground yields to the weight of the body of a runner, ________ to the body.
A.the stress it is greater
B.greater is the stress
C.greater stress is
D.the greater the stress