用来控制产品均值和散度的控制图有哪些？
参考答案：
用来控制产品均值和散度的控制图有X-R Chart和X-Std Chart。
There were already five people in the car but they managed to take me as well . It ____ a comfortable journey .
A．can''t e
B．shouldn''t be
C．mustn''t have been
D．couldn''t have been
假神的病机是
A．气血不足，精神亏损B．机体阴阳严重失调C．脏腑虚衰，功能低下D．精气衰竭，虚阳外越E．阴盛于内，格阳于外
