装配图中,当需要表示某些零件运动范围和极限位置时,可用()线画出该零件的极限位置图。
A、细点画
B、粗点画
C、虚
D、双点画
参考答案:D
Alice, bent ______ losing weight, increased the time of exercise to three hours______ a time.[ ]
A. on; in
B. on; for
C. with; for
D. with; at
尿白细胞一小时计数法阳性标准是多少万每小时()
A.1~3
B.3~10
C.10~20
D.20~40
E.>40