颅脑外伤时，颅缝宽度超过以下数值，其意义如线形骨折（）
A.1.5mm
B.3.0mm
C.2.5mm
D.2.0mm
E.4.0mm
参考答案：D
Krashen’s monitor hypothesis states that learning has only one function, and that is as a______.
A．，正电荷
B．，正电荷
C．，负电荷
D．，负电荷
，正电荷
，正电荷
，负电荷
，负电荷