衡量有氧训练的运动强度较常用的简便指标是（）。
A.体重
B.睡眠
C.靶心率
D.脉压差
E.食欲
参考答案：C
The young teacher made ________ silly mistake and out of _________respect for his feelings, I didn’t point it out in class.
A．the; the
B．the; /
C．a; the
D．a; /
照相加网凹版与影写版制版工艺有何不同？
