插削花键时，插刀主切削刃没有安装成水平位置会造成键槽宽度不正确（）
参考答案：对
80岁以上老人肾单位的数目是20岁年轻人的
A．3/4
B．1/2
C．1/3
D．1/4
E．1/5
Burns will tell his board(全体委员) today that the Sports Council wants a non-voting member to _______the way the cash is spent.
A．look over
B．watch over
C．look through
D．watch out
