錾削小型板料时，錾子对着錾面约（）錾削。
A.30°
B.45°
C.60°
D.90°
参考答案：B
关于宫颈糜烂的物理治疗，下列哪一项是正确的（）
A.治疗后禁止性生活1周
B.治疗后4～8周禁止盆浴和 * * 冲洗
C.治疗后3～4周脱痂
D.治疗宜在月经净后15天左右进行
E.病变较深者治疗后需1～2周治愈
It is very kind ______ you to help me with my lessons because it is very difficult ______me to learn them well.
A．of; for
B．of; of
C．for; of
D．for; for
